'Rump steak' definitions:

Definition of 'rump steak'

noun

A steak cut from the rump

From: GCIDE

Rump \Rump\, n. [OE. rumpe; akin to D. romp trunk, body, LG. rump, G. rumpf, Dan. rumpe rump, Icel. rumpr, Sw. rumpa rump, tail.]
1. The end of the backbone of an animal, with the parts adjacent; the buttock or buttocks. [1913 Webster]
2. Among butchers, the piece of beef between the sirloin and the aitchbone piece. See Illust. of Beef. [1913 Webster]
3. Fig.: The hind or tail end; a fag-end; a remnant. [1913 Webster]
Rump Parliament, or The Rump (Eng. Hist.), the remnant of the Long Parliament after the expulsion by Cromwell in
1648 of those who opposed his purposes. It was dissolved by Cromwell in 1653, but twice revived for brief sessions, ending finally in 1659. [1913 Webster]
The Rump abolished the House of Lords, the army abolished the Rump, and by this army of saints Cromwell governed. --Swift. [1913 Webster]
Rump steak, a beefsteak from the rump. --Goldsmith. [1913 Webster]