get back at   (get revenge, get even) 报复，报仇  
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● I am so hurt that I want to get back at him.

我受的伤害这么大，我要报复。

● When my boy friend broke up with me, I dated his best friend to get back at him.

当我的男朋友跟我分手后，我开始跟他最要好的朋友约会以作报复。