"As soon as I turned my back, he started writing on the wall."
2.VerbTo forsake, to abandon; to ignore. .mw-parser-output .object-usage-tag{font-style:italic}.mw-parser-output .deprecated{color:var(--wikt-palette-grey-lime-8,olivedrab)}[with on]
"He got off to a strong start, only to turn his back on the project two months later."
3.VerbTo turn away, as when fleeing or in contempt.