whack - definition and synonyms

verb [transitive] informal 

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present tense
present participlewhacking
past tensewhacked
past participlewhacked
  1. 1
    to hit someone or something with a lot of force

    I whacked my knee getting out of the car.

    Some kids were whacking the tree with sticks.

    He whacked his little sister on the head with a spoon.

     Synonyms and related words
     Synonyms and related words
  2. 2
    British to put something somewhere quickly or carelessly

    Just whack the fish under the grill for ten minutes.

phrasal verbs