n.
Pronunciation: ' hwak, ' wak
Function: verb
Etymology: probably imitative of the sound of a blow
Date: 1719
transitive verb
1 a : to strike with a smart or resounding blow < whack the ball> b : to cut with or as if with a whack : CHOP
2 chiefly British : to get the better of : DEFEAT
3 slang : MURDER , KILL
intransitive verb : to strike a smart or resounding blow
– whack · er noun