Turn In One's Grave Meaning

(idiomatic) to be appalled, offended or disgusted by something, despite being deceased

Example: Used other than as an idiom: see turn,‎ in,‎ one's,‎ grave.
  Beethoven is probably turning in his grave at the way that rock group mangled his Ninth Symphony.
  Walt Disney himself must be turning over in his grave right now. He would not stand for his company promoting the image that girls can be beautiful if they are thin and dress like sluts.