1835 Jan. 23/1 I took an Irishman's liberty, and observed to my room companion that he ‘appeared to be very much disturbed in mind’.
1867 J. MacGregor xvi. 192 The rioter..is my English room-companion of the Norway inn.
2003 D. McDuff tr. F. Dostoevsky (rev. ed.) v. i. 431 Pyotr Petrovich..at once came to his senses and spat to one side with energy, bringing a silent but sarcastic smile to the face of his young friend and room-companion.