The part of a bird's back nearest the tail. (noun)
The last or inferior part. (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "rump" in a sentence
"The deer were paint balled in the rump from the broadside."
"Graham WattGlasgow• If Scotland chooses independence Comment, 11 May, what would we call the rump of the UK?"
"Between the falda and the lower rump is the suadero, not usually found on charts and generally only cut to make tacos de suadero, most often found in Mexico City."