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