1. (

• impact ,
• wallop

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

2. (

• wallop

) a severe blow ;

1. (

• whack ,
• wham ,
• whop ,
• wallop

) hit hard; "The teacher whacked the boy" ;

2. (

• wallop

) defeat soundly and utterly; "We'll wallop them!" ;