rump define
rump - the part of an animal that corresponds to the human buttocks. 1  croupe, hindquarters, croup. 2  arse, ass, behind, buns, buttocks, hind end, hindquarters, keister, nates, posterior, prat, rear end, derriere, fanny, tooshie, tush, fundament, seat, backside, bottom, stern, tail end, tail, rear, bum, can, butt.