"turn your back" in Chinese (Simplified)
背对不理睬（比喻）
Definition
指身体转过去使背对某人或某物；引申为在别人需要你时拒绝帮助或不理睬对方。
Usage Notes (Chinese (Simplified))
常用于比喻“对某人不闻不问”或“拒绝帮助”（如：turn your back on someone）。语气较严肃，用于正式和非正式场合。
Examples
Don't turn your back on your friends when they need you.
在朋友需要你时，不要**背对**他们。
He turned his back to the class and wrote on the board.
他**背对**着全班，在黑板上写字。
She felt sad when her brother turned his back on her.
当她哥哥**不理睬**她时，她感到很难过。
After all we did for him, he just turned his back and left.
我们为他做了那么多，他最后却**一走了之，不管我们**。
Sometimes, you just have to turn your back on negative people.
有时候你必须**对负面的人不理睬**。
When things got tough, he couldn't turn his back on his family.
情况变糟时，他无法**抛弃**家人。