/ rʌmp; NAmE / noun
1.
[ C ] the round area of flesh at the top of the back legs of an animal that has four legs
2.
[ U ] (also ˌrump ˈsteak [ C , U ]) a piece of good quality meat cut from the rump of a cow
3.
[ C , usually sing. ] ( humorous ) the part of the body that you sit on
SYN backside
4.
[ sing. ] ( BrE ) the small or unimportant part of a group or an organization that remains when most of its members have left
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WORD ORIGIN
late Middle English : probably of Scandinavian origin; compare with Danish and Norwegian rumpe backside.