would turn in your grave
would turn in your graveBRITISH or
would turn over in your graveAMERICAN
COMMON If you say that someone who is dead would turn in their grave, you mean that they would be very angry or upset about something which is happening now, if they knew about it. Churchill would turn in his grave if he could hear the poor quality of the public speaking in Parliament these days. If the person who wrote that song could hear that guy sing it, he'd turn over in his grave. Note: You can also say that someone would be spinning in their grave. My grandfather would be spinning in his grave if he could see what had been done to his house.