
pay someone back
Meaning: To respond to somebody's behavior with similar behavior.
Example: “She played a prank on me last April, and this year I'm going to pay her back.”
Origin: English treats moral obligation as debt with remarkable consistency, and this phrase sits at the center of that pattern. A person owes an apology, repays kindness, settles a score, gets even, and is made to pay for a crime — the accounting vocabulary runs right through the moral one, and it does so in many languages besides English. What is notable about the debt model is that it is neutral about the sign of what is owed: a balance can be restored by returning a favor or by returning an injury, and the bookkeeping is identical either way. That is exactly why paying someone back is ambiguous out of context and needs tone or circumstance to disambiguate it, in a way that thanking or avenging never do.
More English idioms
- put one's foot down To be firm and unyielding about something.
- put one's money where one's mouth is To back up one's words with money or action.
- rack one's brain To search through one's mind intensively; to try very hard to think of something.
- rule of thumb A rough guide; an unwritten or customary rule based on experience or practice.
- save face To avoid humiliation and keep one's dignity or reputation.
- see eye to eye To agree.
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