To be treacherous to

• sell out

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• ?

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• double-cross

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To disclose in a breach of confidence

• discover

  1. To notice or learn, especially by making an effort:
  2. To be the first, or the first of one's group or kind, to find, learn of, or observe.
  3. To learn about for the first time in one's experience:

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  1. To notice or learn, especially by making an effort:
  2. To be the first, or the first of one's group or kind, to find, learn of, or observe.
  3. To learn about for the first time in one's experience:

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• spill

  1. To cause or allow (a substance) to run or fall out of a container.
  2. To scatter (objects) from containment:
  3. To shed (blood).

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  1. To cause or allow (a substance) to run or fall out of a container.
  2. To scatter (objects) from containment:
  3. To shed (blood).

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• unveil

  1. To remove a veil or covering from.
  2. To disclose; reveal.
  3. To take off one's veil.

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  1. To remove a veil or covering from.
  2. To disclose; reveal.
  3. To take off one's veil.

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• uncover

  1. To remove the cover from:
  2. To manifest or disclose; reveal:
  3. To remove the hat from, as in respect or reverence.

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  1. To remove the cover from:
  2. To manifest or disclose; reveal:
  3. To remove the hat from, as in respect or reverence.

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• tell

  1. To communicate by speech or writing; express with words:
  2. To give a detailed account of; narrate:
  3. To notify (someone) of something; inform:

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  1. To communicate by speech or writing; express with words:
  2. To give a detailed account of; narrate:
  3. To notify (someone) of something; inform:

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• reveal

  1. To make known (something concealed or unknown):
  2. To cause to be seen; show:
  3. To make known by supernatural or divine means:

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  1. To make known (something concealed or unknown):
  2. To cause to be seen; show:
  3. To make known by supernatural or divine means:

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• let out

  1. A means of evasion or avoidance.

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  1. A means of evasion or avoidance.

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• give away

  1. To make a gift of (something).
  2. To relinquish control over.
  3. To formally hand over a bride to the bridegroom; often by her father.

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  1. To make a gift of (something).
  2. To relinquish control over.
  3. To formally hand over a bride to the bridegroom; often by her father.

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• expose

  1. To subject or allow to be subjected to an action, influence, or condition:
  2. To subject (a photographic film, for example) to the action of light.
  3. To deprive of shelter or protection; lay open to danger or harm:

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  1. To subject or allow to be subjected to an action, influence, or condition:
  2. To subject (a photographic film, for example) to the action of light.
  3. To deprive of shelter or protection; lay open to danger or harm:

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• divulge

  1. To make known (something private or secret).
  2. To proclaim publicly.

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  1. To make known (something private or secret).
  2. To proclaim publicly.

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• blab

  1. To reveal (secret matters), especially through indiscreet or unreserved talk.
  2. To reveal secret matters indiscreetly.
  3. To chatter thoughtlessly or indiscreetly.

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  1. To reveal (secret matters), especially through indiscreet or unreserved talk.
  2. To reveal secret matters indiscreetly.
  3. To chatter thoughtlessly or indiscreetly.

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To cause to accept what is false, especially by trickery or misrepresentation

• four-flush

  1. A five-card poker hand containing four cards in the same suit.

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  1. A five-card poker hand containing four cards in the same suit.

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• have

  1. To be in possession of:
  2. To possess as a characteristic, quality, or function:
  3. To possess or contain as a constituent part:

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  1. To be in possession of:
  2. To possess as a characteristic, quality, or function:
  3. To possess or contain as a constituent part:

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• bamboozle

  1. To deceive or dupe; hoodwink.
  2. To confuse; bewilder.

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  1. To deceive or dupe; hoodwink.
  2. To confuse; bewilder.

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• trick

  1. An act or procedure intended to achieve an end by deceptive or fraudulent means.
  2. A mischievous action; a prank:
  3. A stupid, disgraceful, or childish act:

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  1. An act or procedure intended to achieve an end by deceptive or fraudulent means.
  2. A mischievous action; a prank:
  3. A stupid, disgraceful, or childish act:

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• take-in

  1. The act or an instance of swindling or cheating; a deception.

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  1. The act or an instance of swindling or cheating; a deception.

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• mislead

  1. To lead in the wrong direction.
  2. To give a wrong impression or lead toward a wrong conclusion, especially by intentionally deceiving.

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  1. To lead in the wrong direction.
  2. To give a wrong impression or lead toward a wrong conclusion, especially by intentionally deceiving.

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• humbug

  1. Something intended to deceive; a hoax or fraud.
  2. A person who claims to be other than what he or she is; an impostor.
  3. Nonsense; rubbish.

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  1. Something intended to deceive; a hoax or fraud.
  2. A person who claims to be other than what he or she is; an impostor.
  3. Nonsense; rubbish.

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• hoodwink

  1. To deceive or swindle by deception.
  2. To blindfold.
  3. To conceal.

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  1. To deceive or swindle by deception.
  2. To blindfold.
  3. To conceal.

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• fool

  1. One who is deficient in judgment, sense, or understanding.
  2. One who acts unwisely on a given occasion:
  3. One who has been tricked or made to appear ridiculous; a dupe:

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  1. One who is deficient in judgment, sense, or understanding.
  2. One who acts unwisely on a given occasion:
  3. One who has been tricked or made to appear ridiculous; a dupe:

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• dupe

  1. A person who is easily deceived or is used to carry out the designs of another.
  2. To deceive (an unwary person).

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  1. A person who is easily deceived or is used to carry out the designs of another.
  2. To deceive (an unwary person).

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• double-cross

  1. To betray by acting in contradiction to a prior agreement.
  2. An act of betraying an ally, friend, or associate.
  3. A cross in which each parent is the product of a single cross. It can be represented as AB x CD, where A, B, C, and D are inbred lines.

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  1. To betray by acting in contradiction to a prior agreement.
  2. An act of betraying an ally, friend, or associate.
  3. A cross in which each parent is the product of a single cross. It can be represented as AB x CD, where A, B, C, and D are inbred lines.

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• delude

  1. To cause to hold a false belief; deceive thoroughly:
  2. To elude or evade.
  3. To frustrate the hopes or plans of.

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  1. To cause to hold a false belief; deceive thoroughly:
  2. To elude or evade.
  3. To frustrate the hopes or plans of.

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• deceive

  1. To cause to believe what is not true; mislead.
  2. To catch by guile; ensnare.
  3. To practice deceit.

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  1. To cause to believe what is not true; mislead.
  2. To catch by guile; ensnare.
  3. To practice deceit.

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• cozen

  1. To mislead by means of a petty trick or fraud; deceive.
  2. To persuade or induce to do something by cajoling or wheedling.
  3. To obtain by deceit or persuasion.

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  1. To mislead by means of a petty trick or fraud; deceive.
  2. To persuade or induce to do something by cajoling or wheedling.
  3. To obtain by deceit or persuasion.

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• bluff

  1. To engage in a false display of confidence or aggression in order to deceive or intimidate someone:
  2. To make a display of aggression, as by charging or baring the teeth, as a means of intimidating another animal.
  3. To try to mislead opponents in a card game by heavy betting on a poor hand or by little or no betting on a good one.

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  1. To engage in a false display of confidence or aggression in order to deceive or intimidate someone:
  2. To make a display of aggression, as by charging or baring the teeth, as a means of intimidating another animal.
  3. To try to mislead opponents in a card game by heavy betting on a poor hand or by little or no betting on a good one.

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• beguile

  1. To deceive by guile or charm:
  2. To deprive (someone) of something by guile or deceit; cheat:
  3. To distract the attention of; divert:

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  1. To deceive by guile or charm:
  2. To deprive (someone) of something by guile or deceit; cheat:
  3. To distract the attention of; divert:

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To deliver into the hands of an enemy

• turn state's evidence

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• cross up

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• bite-the-hand-that-feeds-one

  1. (idiomatic) To cause harm to a benefactor.

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  1. (idiomatic) To cause harm to a benefactor.

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• stab-in-the-back

  1. An act of betrayal or treachery
  2. (idiomatic) To betray (somebody).

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  1. An act of betrayal or treachery
  2. (idiomatic) To betray (somebody).

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• sell out

  1. To sell all of a product that is in stock.
  2. (idiomatic) To abandon or betray one's supporters or principles to seek profit or other personal advantage.
  3. Alternative spelling of sellout.

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  1. To sell all of a product that is in stock.
  2. (idiomatic) To abandon or betray one's supporters or principles to seek profit or other personal advantage.
  3. Alternative spelling of sellout.

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• deliver up

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• double-cross

  1. To betray by acting in contradiction to a prior agreement.
  2. An act of betraying an ally, friend, or associate.
  3. A cross in which each parent is the product of a single cross. It can be represented as AB x CD, where A, B, C, and D are inbred lines.

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  1. To betray by acting in contradiction to a prior agreement.
  2. An act of betraying an ally, friend, or associate.
  3. A cross in which each parent is the product of a single cross. It can be represented as AB x CD, where A, B, C, and D are inbred lines.

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• give the Judas kiss to

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• play Judas

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• sell-down-the-river

  1. (idiomatic) To betray, especially in a manner which causes serious difficulty for the one betrayed.

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  1. (idiomatic) To betray, especially in a manner which causes serious difficulty for the one betrayed.

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• deceive

  1. To cause to believe what is not true; mislead.
  2. To catch by guile; ensnare.
  3. To practice deceit.

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  1. To cause to believe what is not true; mislead.
  2. To catch by guile; ensnare.
  3. To practice deceit.

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• disappoint

  1. To fail to satisfy the hope, desire, or expectation of.
  2. To frustrate or thwart:
  3. To cause disappointment.

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  1. To fail to satisfy the hope, desire, or expectation of.
  2. To frustrate or thwart:
  3. To cause disappointment.

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• let down

  1. Used other than as an idiom: see let,"Ž down.
  2. To allow to descend.
  3. (idiomatic) To disappoint; to betray or fail somebody

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  1. Used other than as an idiom: see let,"Ž down.
  2. To allow to descend.
  3. (idiomatic) To disappoint; to betray or fail somebody

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• trick

  1. An act or procedure intended to achieve an end by deceptive or fraudulent means.
  2. A mischievous action; a prank:
  3. A stupid, disgraceful, or childish act:

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  1. An act or procedure intended to achieve an end by deceptive or fraudulent means.
  2. A mischievous action; a prank:
  3. A stupid, disgraceful, or childish act:

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• go over to the enemy

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• be disloyal to

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• be false-hearted to

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• be false to

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• break one's promise

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• delude

  1. To cause to hold a false belief; deceive thoroughly:
  2. To elude or evade.
  3. To frustrate the hopes or plans of.

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  1. To cause to hold a false belief; deceive thoroughly:
  2. To elude or evade.
  3. To frustrate the hopes or plans of.

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• turn informer

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• commit treason

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• turn in

  1. (idiomatic) to submit something; to give
  2. (idiomatic) to relinquish; give up; to tell on someone to the authorities (especially to turn someone in)
  3. (intransitive, idiomatic) to go to sleep; retire to bed

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  1. (idiomatic) to submit something; to give
  2. (idiomatic) to relinquish; give up; to tell on someone to the authorities (especially to turn someone in)
  3. (intransitive, idiomatic) to go to sleep; retire to bed

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• inform against

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• inform on

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• break faith (with)

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• play false

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To lead astray

• corrupt

  1. Marked by immorality and perversion; depraved.
  2. Venal or dishonest:
  3. Containing errors or alterations, especially ones that prevent proper understanding or use:

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  1. Marked by immorality and perversion; depraved.
  2. Venal or dishonest:
  3. Containing errors or alterations, especially ones that prevent proper understanding or use:

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• misguide

  1. To cause to be misguided; mislead.

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  1. To cause to be misguided; mislead.

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• seduce

  1. To attract or lead (someone) away from proper behavior or thinking:
  2. To induce (someone) to engage in sexual activity, as by flirting or persuasion.
  3. To entice into a different state or position:

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  1. To attract or lead (someone) away from proper behavior or thinking:
  2. To induce (someone) to engage in sexual activity, as by flirting or persuasion.
  3. To entice into a different state or position:

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To reveal

• make-known

  1. to announce some information generally.
  2. to disclose a secret.

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  1. to announce some information generally.
  2. to disclose a secret.

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• uncover

  1. To remove the cover from:
  2. To manifest or disclose; reveal:
  3. To remove the hat from, as in respect or reverence.

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  1. To remove the cover from:
  2. To manifest or disclose; reveal:
  3. To remove the hat from, as in respect or reverence.

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• disclose

  1. To expose to view, as by removing a cover; uncover.
  2. To make known (something heretofore kept secret).

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  1. To expose to view, as by removing a cover; uncover.
  2. To make known (something heretofore kept secret).

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• divulge

  1. To make known (something private or secret).
  2. To proclaim publicly.

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  1. To make known (something private or secret).
  2. To proclaim publicly.

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