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See more synonyms for backside on Thesaurus.com
  1. the rear or back part or view of an object, person, scene, etc.; that part which is opposite the front.
  2. rump; buttocks.
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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. 2018

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British Dictionary definitions for backside


  1. the back of something
  2. (ˈbækˌsaɪd) informal the buttocks
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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

Word Origin and History for backside


c.1400, from back (adj.) + side (n.). In the specific sense of "rump, buttocks" it is first recorded c.1500.

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Online Etymology Dictionary, © 2010 Douglas Harper