get off someone's back
get off (one's) back
To stop nagging or pestering one about something. Often said as an imperative. Would you please get off my back? I'm not going to the interview, and that's final! My uncle has finally gotten off my back about helping him out at the hardware store, thank goodness.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
get off someone's backINFORMAL
If you tell someone to get off your back, you mean that you want them to stop criticizing you and leave you alone. He kept on at me to such an extent that occasionally I wished he would get off my back. He wanted his mom to get off his back about marriage. Note: You can also say that you get someone off your back. I decided that I would get them off my back and out of my life. Compare with on someone's back.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012