WordWeb Online

1. Hit hard
   "He walloped his opponent";
   - sock [informal], bop [informal], whop [informal], whap [N. Amer, informal], bonk [informal], bash [informal], clonk [informal], boink [N. Amer, informal], whack [informal], wham [informal], lamp [UK, informal], clock [UK, informal], belt [informal]
    
2. Defeat soundly and utterly
   "We'll wallop them!"

1. A forceful consequence; a strong effect
   "the book packs a wallop";
   - impact
    
2. A severe blow

Derived forms: wallops, walloping, walloped

Type of: blow, consequence, defeat, effect, event, get the better of, hit, issue, outcome, overcome, result, upshot

Encyclopedia: Wallop, Robert