back·side

[bak-sahyd]
noun
1.
the rear or back part or view of an object, person, scene, etc.; that part which is opposite the front.
2.
rump; buttocks.

Origin:
1350–1400; Middle English back syde; see back1, side1; compare Old English bæce backside

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
backside (ˌbækˈsaɪd) [Click for IPA pronunciation guide]
 
n
1.  the back of something
2.  informal the buttocks

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Backside is always a great word to know.
So is doohickey. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a gadget; dingus; thingumbob.
Etymonline
Word Origin & History

backside
late 15c., from back (adj.) + side. In the specific sense of "rump, buttocks" it is first recorded c.1500.
Online Etymology Dictionary, © 2010 Douglas Harper
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Slang Dictionary

backside definition


  1. n.
    the buttocks; one's rear. : There is some mustard or something on your backside.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw Hill.
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Example sentences
The backside has four input jacks, two for standard red-and-white audio cables
  and two for stereo pin plugs.
The toll free number was publicized on billboards, in literature and on the
  backside of lottery tickets.
At bedtime he nuzzled her neck and bumped gently into her backside.
In other words, if you commented on the emperor's bare backside, you were
  making yourself irrelevant.
Synonyms
Synonym Game
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