turn a·gainst
phrasal verbturn against somebody | turn somebody against somebody
- to stop or make somebody stop being friendly towards somebody
（使）与…反目成仇，变得敌对 - She turned against her old friend.
她与老朋友翻脸了。 - After the divorce he tried to turn the children against their mother.
他离婚后企图教唆子女反对他们的母亲。
- She turned against her old friend.