thwack

(t̸hwak)

transitive verb

to strike with something flat; whack

Origin: prob. echoic

noun

a blow with something flat

See thwack in American Heritage Dictionary 4

transitive verb thwacked, thwack·ing, thwacks
To strike or hit with a flat object; whack.
noun
A hard blow with a flat object; a whack.

Origin:

Origin: Imitative

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