keep your nose out of sth

to not become involved in other people's activities or relationships

不干预，不过问

She can't keep her nose out of other people's business.

她总是喜欢多管闲事。

- Why should he go abroad?

他为什么必须出国呢?

- Keep your nose out of it.

别多管闲事。

I've already decided how to do it so you can just keep your nose out of it.

我已经决定了如何做，你不用来插手。