upside down

with the upper part undermost.
in or into complete disorder; topsy-turvy: The burglars turned the house upside down.

1300–50; re-formation (see upside) of Middle English upsedoun, earlier up so doun (see up, so1, down1; sense of so obscure)

upside-down, adjective
upside-downness, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
upside down
1.  (usually postpositive; upside-down when prenominal) turned over completely; inverted
2.  informal (upside-down when prenominal) confused; muddled; topsy-turvy: an upside-down world
3.  in an inverted fashion
4.  in a chaotic or crazy manner
[C16: variant, by folk etymology, of earlier upsodown]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

upside down
c.1490, earlier upsadoun (1382), up so down (c.1300); the so perhaps meaning "as if."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They've been in every room in the house-turning things inside out, and upside
If he mapped north to south, the map in his head inverted itself, as if he were
  looking at it upside down.
They hover often, and also fly upside down and backwards.
Place jars upside down on a cloth, allowing space between jars.
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