Longman Dictionary of Contemporary English homepage

Date: 1700-1800
Origin: Probably from the sound of hitting

whack

1 verb
     
whack1 [transitive] informal
1 to hit someone or something hard
whack somebody/something with something
He kept whacking the dog with a stick.
2 British English spoken to put something somewhere
whack something in/on/under etc something
Just whack the bacon under the grill for a couple of minutes.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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