upside down definition, meaning - what is upside down in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online

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English definition of “upside down”

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upside down

adverb, adjective uk   us  
B2 having the part that is usually at the top turned to be at the bottom: Turn the jar upside down and shake it. The plane was flying upside down at high speed.
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(Definition of upside down from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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