make a clean breast of….忏悔

A：You’re restless. Are you in trouble?

B：I’ve done something I shouldn't

A：Then make a clean breast of it, you will feel released.

B：I’ve not decided yet.

甲：你老是不安？有麻烦吗？

乙：我做了件不该做的事。

甲：那就彻底忏悔一下吧。你会感觉轻松一些的。

乙：我还没决定呢。