pay back

pay back idiom
  1. Repay a debt or a loan, as in I'll pay you back next month.
  2. Also, pay back in someone's own coin. Revenge oneself, repay in kind, as in He thought he could get away with copying my plans, but I'll pay him back in his own coin. This expression refers to repaying a debt in exactly the same currency in which the money had been lent. [c. 1600]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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