Rump

Webster's Dictionary of the English Language

·noun The hind or tail end; a fag-end; a remnant.

II. Rump ·noun The end of the backbone of an animal, with the parts adjacent; the buttock or buttocks.

III. Rump ·noun Among butchers, the piece of beef between the sirloin and the aitchbone piece. ·see ·Illust. of Beef.