have an axe to grind
心怀叵测
A:One family skeleton of ours was that my younger brother has an axe to grind.
A:我们家的一个家丑是我的弟弟居心叵测。
B:What did he aim at?
B：他的目的是什么?
A:He began to be interested in finance because he thought he would be able to inherit the family's fortune.
A：他认为自己能继承家产而开始对金融产生了兴趣。
B:How could he have such an ill intention? I think your father can see that through.
B:他的用意怎会如此险恶?我觉得你父亲能看穿他。