We found one dictionary that defines the word pay back in someone's own coin:

General (1 matching dictionary)

1. pay back in someone's own coin: Wiktionary

Definitions from Wiktionary (pay back in someone's own coin) ▸ verb:  (figuratively) To give tit for tat. ▸ Words similar to pay back in someone's own coin ▸ Usage examples for pay back in someone's own coin ▸ Idioms related to pay back in someone's own coin ▸ Wikipedia articles (New!) ▸ Words that often appear near pay back in someone's own coin ▸ Rhymes of pay back in someone's own coin ▸ Invented words related to pay back in someone's own coin