backside

[ bak-sahyd ]
/ ˈbækˌsaɪd /

noun

the rear or back part or view of an object, person, scene, etc.; that part which is opposite the front.
rump; buttocks.

Origin of backside

1350–1400; Middle English back syde; see back1, side1; compare Old English bæce backside
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for backside

backside

/ (ˌbækˈsaɪd) /

noun

the back of something
(ˈbækˌsaɪd) informal the buttocks
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012