wallop

Noun

• a severe blow

• a forceful consequence; a strong effect
  • the book had an important impact on my thinking
    
  • the book packs a wallop
    

Verb

• defeat soundly and utterly
  • We'll wallop them!
    

• hit hard
  • The teacher whacked the boy
    

Related words

• Synonyms: 
  impact , whack , wham , whop