I'll let it pass, and hold my tongue.

但是，我会让过去就此过去，并且绝口不提。

youdao

I overheard what you said about my new outfit, but I'll let it pass.

我偶然听到你在对我的新装发表评论。

youdao

I'll let it pass and hold my tongue and you will think that I've moved on...

我会让它过去，而且闭上嘴，而你会认为我已经继续自己的生活了。

youdao