noun
stroke, thump, wham; see blow 1.
suddenly, with one stroke, instantaneously; see quickly 1, soon 1.
out of order, not working, out of kilter, spoiled; see ruined 1, 2.
attempt, endeavor, do one's best; see try 1.
See whack in Webster's New World Roget's A-Z Thesaurus II
To deliver a powerful blow to suddenly and sharply:
To hit with a quick, sharp blow of the hand:
To strike, set down, or close in such a way as to make a loud noise:
A sudden sharp, powerful stroke:
A quick, sharp blow, especially with the hand:
A brief trial:
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