IdiomDaily LifeEnglish

tit for tat

Meaning: An action in exchange for another equal action.

Example: “He hid her keys, she hid his shoes: pure tit for tat.”

Equivalents in other languages

Origin: Most likely an alteration of the earlier "tip for tap," attested in the 1500s, where a tip and a tap are both light blows — so the original sense was a blow returned for a blow received, and the phrase described physical retaliation before it described anything more abstract. The modern shape follows the vowel-alternation pattern English applies to reduplicated pairs, the same one that fixes the order in pitter-patter, tick-tock, and zigzag. The expression acquired an unexpected second career in the twentieth century, when Tit for Tat was the name given to the strikingly successful strategy in computer tournaments of the repeated prisoner's dilemma: cooperate first, then simply do whatever the other player did last.

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