'pay back' definitions:

Definition of 'pay back'

From: WordNet
verb
Act or give recompense in recognition of someone's behavior or actions [syn: reward, repay, pay back]
verb
Take vengeance on or get even; "We'll get them!"; "That'll fix him good!"; "This time I got him" [syn: pay back, pay off, get, fix]

Synonyms of 'pay back'

From: Moby Thesaurus

Words containing 'pay back'