Boudoir

google

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late 18th century: French, literally ‘sulking-place’, from bouder ‘pout, sulk’.

wiktionary

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Borrowed from French boudoir, from bouder(“to sulk”).

etymonline

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boudoir (n.)

"room where a lady may retire to be alone or to receive her intimate friends," 1777, from French boudoir (18c.), literally "pouting room," from bouder "to pout, sulk," which, like pout, probably ultimately is imitative of puffing.