Entry 1 sense Webster, 1913 Bedfellow /bĕd'-fĕlˌ-ō/ · Bed·fel·low · IPA /ˈbɛdˌfɛloʊ/ 01 n. One who lies with another in the same bed; a person who shares one's couch. 1. One who lies with another in the same bed; a person who shares one's couch.