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The English word 'keister', meaning "buttocks" arrived on the books in our language in 1931, possibly derived from the underworld meaning of a "safe or strongbox"(1914), earlier "a burglar's toolkit that can be locked"(1881); probably from the British dialect kist,(1300s northern form of chest, from Old Norse kista) or its German cognate Kiste, meaning "chest, box". The connection may have come from the pickpocket slang sense of "rear trouser pocket" in the 1930s.

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14y ago

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