Meaning of “turn in your grave” in the English Dictionary

british dictionary

"turn in your grave" in British English

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turn in your grave

UK US turn/roll over in your grave

If you say that a dead person would turn in their grave, you mean that they would be very angry or upset about something:

She'd turn in her grave if she knew what he was spending his inheritance on.

(Definition of “turn in your grave” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)