whack
1 Americanverb (used with object)
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to strike with a smart, resounding blow or blows.
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Slang. to divide into or take in shares (often followed byup ).
Whack the loot between us two.
verb (used without object)
noun
verb phrase
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whack out to produce quickly or, sometimes, carelessly.
She whacks out a short story every week or so.
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whack off
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to cut off or separate with a blow.
The cook whacked off the fish's head.
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Slang: Vulgar. to masturbate.
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idioms
noun
verb
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to strike with a sharp resounding blow
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informal (usually passive) to exhaust completely
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informal (tr; usu foll by in or on) to put something on to or into something else with force or abandon
whack on some sunscreen
noun
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slang (tr) to murder
if you were out of line you got whacked
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a sharp resounding blow or the noise made by such a blow
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informal a share or portion
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informal a try or attempt (esp in the phrase have a whack at )
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informal out of order; unbalanced
the whole system is out of whack
interjection
Other Word Forms
Derived Forms
Conjugated Forms
Present
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have whackedperfect
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has whackedperfect 3rd person singular
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am whackingprogressive 1st person singular
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have been whackingperfect progressive
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has been whackingperfect progressive 3rd person singular
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is whackingprogressive 3rd person singular
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are whackingprogressive
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whackssingular 3rd person
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whackingparticiple
Past
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had whackedperfect
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were whackingprogressive plural
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was whackingprogressive singular
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had been whackingperfect progressive
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whackedsimple
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whackedparticiple
Future
Etymology
Origin of whack
First recorded in 1710–20; originally dialect, Scots form of thwack; cf. whang 2, whittle
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The bad news boomerang of Lord Mandelson's appointment continues to whizz around and whack this government at regular intervals - and inflict ongoing headaches.
From BBC • Jun. 1, 2026
A bright sky is a signal that it’s daytime, so getting that signal at night throws all of that out of whack.
From Los Angeles Times • May 8, 2026
Trump later told reporters that a gunman he described as a "lone wolf" and a "whack job" had charged through security screening just outside the ballroom.
From Barron's • Apr. 26, 2026
Torsten Slok, Apollo chief Economist, thinks something is out of whack in the Treasury market.
From MarketWatch • Mar. 30, 2026
She got the first and biggest share of everything—the first whack at the new clothes and the biggest part of any special treat.
From "The Heart is a Lonely Hunter" by Carson McCullers
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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.