She had no axe to grind and was only acting out of concern for their safety.

她毫无私心，这样做只是出于对他们安全的担心。

《牛津词典》

He looks like he's got an axe to grind. Better have a talk with him.

他看来是牢骚满腹，你最好找他谈谈。

《新英汉大辞典》

I have an axe to grind!

我有把斧子要磨。

youdao

What makes Mr Sudetic's book compelling is that he has no axe to grind.

ECONOMIST: The Yugoslav war

Most of the firms with an axe to grind are based in Silicon Valley.

ECONOMIST: And the winners are

And even if they are employees, maybe they have an axe to grind.

FORBES: Continued Questions About Patti Hart's Leadership At IGT