Dictionary

upside down

adverb up·side down \ˈəp-ˌsīd-ˈdan\

: with the top at the bottom and the bottom at the top : placed so that the end that should be at the top is at the bottom

Full Definition of UPSIDE DOWN

1
:  in such a way that the upper and the lower parts are reversed in position
2
:  in or into great disorder <turned their world upside down>
upside–down adjective
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Origin of UPSIDE DOWN

alteration of Middle English up so doun, from up + so + doun down
First Known Use: 15th century
UPSIDE-DOWN Defined for Kids

upside down

adverb up·side down \ˈəp-ˌsīd-\

Definition of UPSIDE DOWN for Kids

1
:  in such a way that the upper part is underneath and the lower part is on top <I turned his chocolate pudding upside down on his tray. — Jerry Spinelli, Crash>
2
:  in or into great confusion <The injury turned her life upside down.>

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