turn (over) in (one's) grave(redirected from turning over in their graves)
turn (over) in (one's) grave
To (hypothetically) show enormous anger, disfavor, or regret for someone's actions or something that happens after one has died. That is, if someone were still alive, they would be greatly upset, angered, or disgusted by what has happened. I can't believe you're using our employees' pension payments to prop up a Ponzi scheme. The founder of this once-great company would be turning in his grave to see its directors stoop so low. Your poor mother would turn over in her grave if she heard the horrible things you were saying about your sister.
turn (over) in one's graveand roll (over) in one's grave
Fig. to show enormous disfavor for something that has happened after one's death. If our late father heard you say that, he'd turn over in his grave. Please don't change the place around too much when I'm dead. I do not wish to be rolling in my grave all the time.
turn in one's grave
Also turn over in one's grave. Be very upset. This idiom is used only of a dead person, who in all likelihood would have been upset by developments in question, as in If she knew you'd sold her jewelry, she'd turn over in her grave. [Late 1800s]