The expression is 'to have an axe to grind'.

今天要讲的表达方式就是to have an axe to grind。

There's a related expression, which is " to have an axe to grind" (grind).

有一个相关的表达，就是“to have a ax to grind”（磨）。

" To have an axe to grind" means that you are angry, or you want to do something to treat someone else badly, to get revenge, to make someone else suffer who has perhaps made you suffer.

“to have an axe to grind” 意思是你生气了， 或者你想做一些事情来伤害别人，报复，让可能让你受苦的人受苦。