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]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.