To cause (another) to believe or feel sure about something

• convince

  1. To persuade to do something
  2. (Obsolete) To prove to be wrong or guilty.
  3. To cause (someone) by the use of argument or evidence to believe something or to take a course of action.

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  1. To persuade to do something
  2. (Obsolete) To prove to be wrong or guilty.
  3. To cause (someone) by the use of argument or evidence to believe something or to take a course of action.

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• persuade

  1. To cause to do something by reasoning, urging, or inducement; prevail upon
  2. To cause (someone) to accept a point of view or to undertake a course of action by means of argument, reasoning, or entreaty:
  3. To induce to believe something; convince

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  1. To cause to do something by reasoning, urging, or inducement; prevail upon
  2. To cause (someone) to accept a point of view or to undertake a course of action by means of argument, reasoning, or entreaty:
  3. To induce to believe something; convince

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• satisfy

  1. To fulfill or answer the requirements or conditions of (something)
  2. To provide sufficient explanation to dispel or answer (a doubt or question).
  3. To give satisfaction.

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  1. To fulfill or answer the requirements or conditions of (something)
  2. To provide sufficient explanation to dispel or answer (a doubt or question).
  3. To give satisfaction.

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• win over

  1. (Idiomatic) To persuade someone, gain someone's support, or make someone understand the truth or validity of something.

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  1. (Idiomatic) To persuade someone, gain someone's support, or make someone understand the truth or validity of something.

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To render certain

• ensure

  1. To make sure or certain; guarantee; secure
  2. (Obs.) insure
  3. (Intransitive) To make sure or certain of something (usually some future event or condition). [from 18th c.]

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  1. To make sure or certain; guarantee; secure
  2. (Obs.) insure
  3. (Intransitive) To make sure or certain of something (usually some future event or condition). [from 18th c.]

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• guarantee

  1. To make something certain.
  2. To assure that something will get done right.
  3. To give a guarantee or guaranty for

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  1. To make something certain.
  2. To assure that something will get done right.
  3. To give a guarantee or guaranty for

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• insure

  1. (Chiefly US) Alternative spelling of ensure: To make sure or certain of; guarantee.
  2. To provide for compensation if some specified risk occurs. Often agreed by policy (contract) to offer financial compensation in case of an accident, theft or other undesirable event.
  3. To contract to be paid or to pay money in the case of loss of (life, property, etc.); take out or issue insurance on (something or someone)

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  1. (Chiefly US) Alternative spelling of ensure: To make sure or certain of; guarantee.
  2. To provide for compensation if some specified risk occurs. Often agreed by policy (contract) to offer financial compensation in case of an accident, theft or other undesirable event.
  3. To contract to be paid or to pay money in the case of loss of (life, property, etc.); take out or issue insurance on (something or someone)

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• secure

  1. To protect or ensure the privacy or secrecy of (a telephone line, for example).
  2. To make certain; ensure:
  3. To get hold or possession of; obtain; acquire

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  1. To protect or ensure the privacy or secrecy of (a telephone line, for example).
  2. To make certain; ensure:
  3. To get hold or possession of; obtain; acquire

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• warrant

  1. To guarantee (a product).
  2. To authorize; to give (someone) warrant or sanction (to do something).
  3. To justify; to give grounds for.

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  1. To guarantee (a product).
  2. To authorize; to give (someone) warrant or sanction (to do something).
  3. To justify; to give grounds for.

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• cinch

  1. (Informal) To make certain; secure or guarantee:
  2. (Slang) To get a firm hold on
  3. To secure (a saddle) by means of a cinch.

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  1. (Informal) To make certain; secure or guarantee:
  2. (Slang) To get a firm hold on
  3. To secure (a saddle) by means of a cinch.

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To guarantee

• vouch-for

  1. (Idiomatic) To affirm the truth or reliability of.

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  1. (Idiomatic) To affirm the truth or reliability of.

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• ensure

  1. To make safe; protect
  2. To make sure or certain; guarantee; secure
  3. (Intransitive) To make sure or certain of something (usually some future event or condition). [from 18th c.]

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  1. To make safe; protect
  2. To make sure or certain; guarantee; secure
  3. (Intransitive) To make sure or certain of something (usually some future event or condition). [from 18th c.]

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• confirm

  1. To prove the truth, validity, or authenticity of; verify
  2. To make firmer; strengthen:
  3. To support or establish the certainty or validity of; verify:

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  1. To prove the truth, validity, or authenticity of; verify
  2. To make firmer; strengthen:
  3. To support or establish the certainty or validity of; verify:

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• secure

  1. To protect or ensure the privacy or secrecy of (a telephone line, for example).
  2. To make certain; ensure:
  3. To get hold or possession of; obtain; acquire

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  1. To protect or ensure the privacy or secrecy of (a telephone line, for example).
  2. To make certain; ensure:
  3. To get hold or possession of; obtain; acquire

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To convince

• prove

  1. To be shown to be such; turn out:
  2. To show (oneself) to be what is specified or to have a certain characteristic:
  3. To verify (the result of a calculation).

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  1. To be shown to be such; turn out:
  2. To show (oneself) to be what is specified or to have a certain characteristic:
  3. To verify (the result of a calculation).

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• persuade

  1. To induce to believe something; convince
  2. To cause to do something by reasoning, urging, or inducement; prevail upon
  3. To cause (someone) to accept a point of view or to undertake a course of action by means of argument, reasoning, or entreaty:

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  1. To induce to believe something; convince
  2. To cause to do something by reasoning, urging, or inducement; prevail upon
  3. To cause (someone) to accept a point of view or to undertake a course of action by means of argument, reasoning, or entreaty:

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• reassure

  1. To assure again:
  2. To restore the confidence of
  3. To restore confidence to:

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  1. To assure again:
  2. To restore the confidence of
  3. To restore confidence to:

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To promise

• pledge

  1. To offer or guarantee by a solemn binding promise:
  2. To promise to join (a fraternity or similar organization).
  3. To accept as a

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  1. To offer or guarantee by a solemn binding promise:
  2. To promise to join (a fraternity or similar organization).
  3. To accept as a

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• affirm

  1. To declare positively; assert to be true:
  2. To assert that one will give true testimony equivalent to that which would be given while under oath.
  3. To say positively; declare firmly; assert to be true

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  1. To declare positively; assert to be true:
  2. To assert that one will give true testimony equivalent to that which would be given while under oath.
  3. To say positively; declare firmly; assert to be true

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• swear

  1. To pledge or vow on oath
  2. (Law) To administer a legal oath to:
  3. To promise or pledge with a solemn oath; vow:

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  1. To pledge or vow on oath
  2. (Law) To administer a legal oath to:
  3. To promise or pledge with a solemn oath; vow:

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To encourage

• reassure

  1. To assure again; repeat a confident declaration or promise
  2. To assure again:
  3. To restore confidence to:

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  1. To assure again; repeat a confident declaration or promise
  2. To assure again:
  3. To restore confidence to:

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• inspirit

  1. To strengthen or hearten; give impetus or vigour
  2. To put spirit into; give life or courage to; cheer; exhilarate

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  1. To strengthen or hearten; give impetus or vigour
  2. To put spirit into; give life or courage to; cheer; exhilarate

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• hearten

  1. To give heart to; to encourage, urge on, cheer, give confidence to.
  2. To cheer up; encourage

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  1. To give heart to; to encourage, urge on, cheer, give confidence to.
  2. To cheer up; encourage

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• comfort

  1. To ease physically; relieve:
  2. To soothe in distress or sorrow; ease the misery or grief of; bring consolation or hope to
  3. (Law) To help; aid

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  1. To ease physically; relieve:
  2. To soothe in distress or sorrow; ease the misery or grief of; bring consolation or hope to
  3. (Law) To help; aid

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