If someone dosses somewhere, they sleep in a place which is uncomfortable, usually because they have nowhere else to live. young people dossing in the streets of our cities. Doss down means the same as doss. When we had eaten, we dossed down in the lounge. doss down to sleep somewhere that is not your usual place, or not a real bed (doss (18-20 centuries), probably from dos , from the idea of lying on your back). a doss work that does not need much effort