1. Hit hard
   "The teacher whackd the boy";
   - sock [informal], bop [informal], whop [informal], whap [N. Amer, informal], bonk [informal], bash [informal], clonk [informal], boink [N. Amer, informal], wham [informal], wallop [informal], lamp [UK, informal], clock [UK, informal], belt [informal]
    
2. Get rid of (someone who may be a threat) by killing
   "the double agent was whacked";
   - neutralize, neutralise [Brit], liquidate, waste [informal], knock off [informal], do in [informal], clip [informal], take out [informal]

1. The act of hitting vigorously
   "he gave the table a whack";
   - knock, belt [informal], rap, whang [informal]
    
2. The sound made by a sharp swift blow
   "The whack of the baseball bat hitting the ball echoed across the field"

Sounds like: voraciousness, veraciousness

Derived forms: whacked, whacking, whacks

See also: bump off [informal], croak [informal], despatch [Brit], dispatch, murder, off [N. Amer, informal], polish off [informal], slay [literary]

Type of: blow, hit, kill, sound

Encyclopedia: Whack