Bedroom

wiktionary

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From bed +‎ room.

etymonline

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bedroom (n.)

also bed-room, "room intended to contain a bed," 1610s, from bed (n.) + room (n.). Used by Shakespeare in a sense "sleeping space, room in a bed" (1580s). Replaced earlier bedchamber (late 14c.). Old English had bedbur, bedcofa. First record of slang bedroom eyes is from 1901.