upside down

noun
1.
with the upper part undermost.
2.
in or into complete disorder; topsy-turvy: The burglars turned the house upside down.

Origin:
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
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World English Dictionary
upside down
 
adj
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
 
adv
3.  in an inverted fashion
4.  in a chaotic or crazy manner
 
[C16: variant, by folk etymology, of earlier upsodown]
 
upside-'downness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
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 for upsidedown
This is upsidedown, or the reverse of traditional practice.
Synonyms
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