wallop in WordNet English dictionary

1. a forceful consequence; a strong effect
   "the book had an important impact on my thinking"; "the book packs a wallop"
   impact  wallop 
   
2. a severe blow
   wallop 
   

1. defeat soundly and utterly
   "We'll wallop them!"
   wallop 
   
2. hit hard
   "The teacher whacked the boy"
   whack  wham  whop  wallop