from Webster:
–turn one's back on or turn one's back upon 1 : to put behind one : depart from *with this month of March we turn our backs on winter Faith Baldwin* *Eskimo turn their backs abruptly on the sea T up a valley from the shore C.D.Forde* 2 : REJECT, DENY *my conscience will not let me turn my back upon a call to service F.D.Roosevelt* *would be turning one's back on history Pius Walsh*; often : to reject unceremoniously or treat with contempt 3 : ABANDON, FORSAKE, DESERT *turning our backs upon the rest of mankind and refusing to enter the cooperative scheme Stephen Duggan* *turned his back on his own people*