upside down Meaning in the Cambridge English Dictionary
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Meaning of “upside down” in the English Dictionary

"upside down" in British English

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upside downadverb, adjective

uk   us  
B2 having the ​part that is usually at the ​topturned to be at the ​bottom: Turn the ​jarupside down and ​shake it. The ​plane was ​flyingupside down at high ​speed.
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(Definition of upside down from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"upside down" in American English

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upside downadjective, adverb [not gradable]

 us   /ˈʌpˌsɑɪd ˈdɑʊn/
having the ​part that is usually at the ​topturned to be at the ​bottom: He put the ​pots upside down on a ​dishtowel to ​let them ​dry.
(Definition of upside down from the Cambridge Academic Content Dictionary © Cambridge University Press)
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