Английский словарь американских идиом - make a clean breast of

{v. phr.} To admit (your guilt); tell all about (your wrong doing); confess everything. * /The police caught the hit-and-run driver and he made a clean breast of his crime./ * /Arthur worried because he cheated on the test, and finally he went to the teacher and made a clean breast of it./ Compare: OFF ONE'S CHEST.