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Definition of thwack:

  1. A heavy blow with something flat or heavy; a thump.
  2. To fill to overflow.
  3. To strike with something flat or heavy; to bang, or thrash: to thump.


clip, smell, taste, peck, attack, let someone have it, bop, smite, biff, catch, smash, conk, slog, paste, sock, bash, blow, slug, whop, sock it to someone, hit, wham, pop, wallop, belt, swat, clout, reek, hit, strike.

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