Turn your back on somebody/something - Idioms by The Free Dictionary
turn your back on somebody/something
turn your back on something
COMMON If you turn your back on something, you reject it or stop being involved in it. He had turned his back on his Communist past and formed a completely new party. The organisation says that young people are increasingly turning their backs on marriage.
turn your back on 1 ignore (someone) by turning away from them. 2 reject or abandon (a person or thing that you were previously involved with).
turn your ˈback on somebody/something refuse to help or support somebody who needs it: She turned her back on her family when she became famous.