Synonym: arse, ass, backside, behind, bottom, bum, buns, butt, buttocks, can, croup, croupe, derriere, fanny, fundament, hind end, hindquarters, keister, nates, posterior, prat, rear, rear end, seat, stern, tail, tail end, tooshie, tush. Similar words: trump, crump, frump, rumple, rumpus, grumpy, frumpy, crumple. Meaning: [rʌmp] 
n. 1. the part of a quadruped that corresponds to the human buttocks 2. fleshy hindquarters; behind the loin and above the round 3. the fleshy part of the human body that you sit on.
n. 1. the part of a quadruped that corresponds to the human buttocks 2. fleshy hindquarters; behind the loin and above the round 3. the fleshy part of the human body that you sit on. 
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61. After the election the party was reduced to a rump.