turn one's back
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- (intransitive, idiomatic) To cease paying attention to something.
- As soon as I turned my back, he started writing on the wall.
- (intransitive, idiomatic, with "on") To forsake, to abandon; to ignore.
- He got off to a strong start, only to turn his back on the project two months later.
- (intransitive) To turn away, as when fleeing or in contempt.