D defs.my
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. 1.
    One who lies with another in the same bed; a person who shares one's couch.