Definition of “whack” - English Dictionary

“whack” in British English

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whackverb

uk /wæk/ us /wæk/

[ T ] to hit someone or something noisily:

He whacked the tree trunk with his stick.
She whacked him in the mouth.

[ T + adv/prep ] UK informal to quickly put something somewhere:

"Where shall I put my bag?" "Just whack it in the corner there."

whacknoun

uk /wæk/ us /wæk/

whack noun (SHARE)

[ S or U ] UK informal a share or part:

Low earners will pay only half the charge but high earners will have to pay full whack (= pay the whole amount).
That's not a fair whack.
take a whack (at sth)

US informal to try to do something:

Take a whack at the homework, then ask for help if you need it.
top whack UK informal

the highest possible price or payment:

They're prepared to pay top whack for goods like this.

whack noun (NOT RIGHT)

out of whack US informal

not operating correctly or looking right:

You can use Carol's old bike - the gears are out of whack, but it still goes.

(Definition of “whack” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“whack” in American English

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whackverb [ T ]

us /hwæk, wæk/

to give someone or something a hard, noisy hit:

He whacked his newspaper on the back of the chair as he talked.
whack
noun [ C ] us /hwæk, wæk/

She gripped her racket with both hands and gave the ball a hard whack.

(Definition of “whack” from the Cambridge Academic Content Dictionary © Cambridge University Press)