Etymology
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bedfellow (n.)

"close friend, roommate, one who shares a bed with another," mid-15c., from bed (n.) + fellow (n.). Also (late 15c) "concubine." Earlier in the "close companion" sense was bed-fere (early 14c.). Old English had simply bedda. Bedsister "husband's concubine" is recorded in Middle English (c. 1300).

updated on April 26, 2017

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Definitions of bedfellow from WordNet

bedfellow (n.)
a temporary associate;
politics makes strange bedfellows
bedfellow (n.)
a person with whom you share a bed;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.