off one's chest
1. remove something so it doesn't bother one anymore
I talked to my friend for a long time and was able to get some problems off my chest.

2. to talk about a problem to someone so that it does not bother you anymore
I talked to my friend and I was able to get some of my problems off my chest.

[TahlilGaran] English Idioms Dictionary ▲

off one's chest
adj. phr., informal Told to someone and so not bothering you anymore; not making you feel worried or upset, because you have talked about it.
After Dave told the principal that he had cheated on the test, he was glad because it was off his chest.
Father felt that Tom wasn't helping enough around the house, so he got it off his chest by giving Tom a list of things to do.
Compare: MAKE A CLEAN BREAST OF.
Antonym: ON ONE'S CHEST.

[TahlilGaran] English Idioms Dictionary ▲