1. thwack - Noun
2. thwack - Verb
3. thwack - Interjection
To strike with something flat or heavy; to bang, or thrash: to thump.
To fill to overflow.
A heavy blow with something flat or heavy; a thump.
Source: Webster's dictionaryHe stepped forward and punched Dorian in the face, hard enough that I heard a thwack. "Ow," moaned Dorian, wincing from the pain. "My greatest asset. Richelle Mead
The teacher smacked the student who had misbehaved Source: Internet
The thwack of the nagarbetta, the thin whip used by the jockey to hit the animal, rises above the yells of the rider, as they near the finishing line — a spectacle repeated through the day, as over 100 pairs of buffaloes compete for honours. Source: Internet
A steady “thwack” rings out at the driving range just outside Nigeria’s capital Abuja. Source: Internet
The thwack of flesh as players collide. Source: Internet