give (someone) a piece of (one's) mind
To tell someone how one feels, often while expressing anger or frustration. I had to give Sarah a piece of my mind after she left my car a mess for the third time this week. Boy, the boss really gave me a piece of his mind after that awful meeting.
give someone a piece of one's mind
Fig. to bawl someone out; to tell someone off. I've had enough from John. I'm going to give him a piece of my mind. Sally, stop it, or I'll give you a piece of my mind.
give (someone) a piece of (one's) mind
To tell someone frankly what one thinks about something, especially when angry.