to strike (something or somebody) with a smart or resounding blow

to defeat or get the better of (somebody)

to place or insert (something) roughly, casually, or quickly

I'll just whack the washing in the machine before we go

chiefly NAmer to murder (somebody)

He got whacked in a drive-by

a smart resounding blow, or the sound it makes

Brit a portion or share

I've paid my whack

an attempt or go