He vowed to take legal action.

他发誓要诉诸法律行动。

《柯林斯英汉双解大词典》

One possible solution, if all else fails, is to take legal action.

如果其他方案都不行，一个可能的解决办法就是提起诉讼。

《柯林斯英汉双解大词典》

We will side with the majority of the people of Philadelphia who oppose this tax and take legal action to stop it.

我们将站在费城大多数人的一边，反对这项税收，并采取法律行动进行阻止。

youdao

Anna decides to take legal action against her parents so she can start making medical decisions herself.

VOA: special.2009.06.12

We believe it is now necessary to take legal action to protect our innovation.

FORBES: Samsung Doesn't Waste Time Trying To Ban Sales Of iPhone 4S In France And Italy

They are furious the government has not said whether they are planning to take legal action.

BBC: A CJD brain

Berkshire Hathaway said it may still take legal action to recover damages from Mr Sokol.

BBC: David Sokol