Rump
Rump , noun
[Old English rumpe; akin to Dutch romp trunk, body, LG. rump, German rumpf, Danish rumpe rump, Icelandic rumpr, Swedish rumpa rump, tail.]
1.
The end of the backbone of an animal, with the parts adjacent; the buttock or buttocks.
2.
Among butchers, the piece of beef between the sirloin and the aitchbone piece. See Illust. of Beef.
3.
The hind or tail end; a fag-end; a remnant. [Figurative:]
The Rump abolished the House of Lords, the army abolished the Rump, and by this army of saints Cromwell governed.