piece of one's mind, (to give someone) a

piece of one's mind

Frank and severe criticism, censure, as in Chuck was furious and gave him a piece of his mind. The word piece here is used in the sense of "portion," but the portion of the mind alluded to always has a negative opinion. [Second half of 1500s]
See also: mind, of, piece
The American Heritage® Dictionary of Idioms by Christine Ammer.

piece of one's mind, (to give someone) a

To express one’s disapproval quite plainly; to give one’s candid opinion. This term has been around since the sixteenth century. John Dryden used it in his play The Maiden Queen (1667, 2.1): “I have told her a piece of my mind already.”
See also: give, of, piece
The Dictionary of Clichés by Christine Ammer
See also:
  • all of a piece
  • all of a piece with (something)
  • all of a piece with something
  • (all) of a piece
  • of a piece
  • take a piece out of (one)
  • piece of cake
  • piece of cake, it's a
  • a piece of cake
  • be a piece of cake