come out in the wash有两层意思。首先，这个短语可以指某件事情会得到圆满的解决。其次，它还有水落石出，真相大白的意思。

【例句】
But the police are looking into it, and I think soon. be brought to light come out in the wash.
但警方正在调查，我认为不久就会水落石出。

This will all come out in the wash. I promise you.
一切终会真相大白的，我向你保证。