‖adv. [ F. ] Back to back; as, to sit dos-à-dos in a dogcart; to dance dos-à-dos, or so that two dancers move forward and pass back to back. [ Webster 1913 Suppl. ]
‖ n. A sofa, open carriage, or the like, so constructed that the occupants sit back to back. [ Webster 1913 Suppl. ]