turn one's back on

turn (one's) back on (someone or something)

To ignore, disregard, or exclude someone or something; to abandon, give up on, or forsake someone or something. It's clear that the company has turned its back on customers. After becoming a successful writer, Jim turned his back on all the people he used to know back home.
See also: back, on, turn

turn one's back on

Deny, reject; also abandon, forsake. For example, I can't turn my back on my own daughter, no matter what she's done, or He simply turned his back on them and never gave it a second thought. [c. 1400] Also see when one's back is turned.
See also: back, on, turn
References in classic literature ?
He says the most horrid things about women's suffrage so nicely, and when I said I believed in equality he just folded his arms and gave me such a setting down as I've never had.
She had taken her degree in geology and mineralogy in the University of London, and while working upon the auriferous rocks of North Wales, after a brief holiday spent in agitating for women's suffrage, she had been struck by the possibility of these reefs cropping up again under the water.