{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. Contrast: ON ONE'S CHEST.
OFF ONE'S CHEST
Meaning of OFF ONE'S CHEST in English
Slang English vocab. Английский сленговый словарь. 2012