Definition of “turn over in your grave” - English Dictionary

American

“turn over in your grave” in American English

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turn over in your grave

to strongly disapprove:

Your father would turn over in his grave if he could hear the way you are talking to me now.
Note: Used to talk about the way someone who is dead would feel about a situation happening now.

(Definition of “turn over in your grave” from the Cambridge Academic Content Dictionary © Cambridge University Press)