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1. Hit hard
   "The teacher whacked the boy";
   - sock, bop, whop, whap, bonk, bash, wham, wallop, clock [Brit, informal]

1. The sound made by a sharp swift blow
    
2. The act of hitting vigorously
   "he gave the table a whack";
   - knock, belt, rap, whang

Sounds like: voraciousness, veraciousness

Derived forms: whacked, whacking, whacks

Type of: blow, hit, sound

Encyclopedia: Whack