To turn your back is to refuse to face or help somebody. Turn your back on a friend.
The figurative use is a serious accusation, since it means abandoning rather than disagreeing. To turn your back on a place means leaving it and not returning.
1phraseturn your backTo refuse to face or help somebody.
“They would not turn your back on a neighbour in that street.”
turn your back is a phrase.
Practised in Body Language & Gestures