dos-dos
Dos`-à-dos", adv. [F.] Defn: 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. Dos`-à-dos", n. Defn: A sofa, open carriage, or the like, so constructed that the occupants sit back to back.