Meaning of “stand sth on its head” in the English Dictionary

british dictionary

"stand sth on its head" in British English

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stand sth on its head

to cause something such as an established belief to be doubted, especially because of new information or discoveries:

New data has stood the traditional explanation of the island's origin on its head.

(Definition of “stand sth on its head” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)