Noun: thwack thwak- A hard blow with a flat object
"The thwack of the cricket bat against the ball was satisfying"
Verb: thwack thwak- Deliver a hard blow to
"The teacher thwacked the student who had misbehaved";
- smack
Derived forms: thwacks, thwacking, thwacked
Type of: blow, hit
Encyclopedia: Thwack