bedfellown.
英 'bedfeləʊ | 美 'bɛdfɛlo
中文n. 伙伴；同床者（等于bedmate）
词根词源
bedfellow (n.)"close friend, roommate," mid-15c., from bed (n.) + fellow (n.). Also (late 15c) "concubine." Earlier in the "close companion" sense was bed-fere (early 14c.). Bedsister "husband\\'s concubine" is recorded in Middle English (c. 1300).
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