Meaning of “upside down” in the English Dictionary

british dictionary

"upside down" in British English

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upside downadverb, adjective

uk /ˌʌp.saɪd ˈdaʊn/ us /ˌʌp.saɪd ˈdaʊn/

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 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 top turned to be at the bottom:

He put the pots upside down on a dish towel to let them dry.

(Definition of “upside down” from the Cambridge Academic Content Dictionary © Cambridge University Press)