make a clean breast of

[make a clean breast of] {v. phr.} To admit (your guilt); tell allabout (your wrong doing); confess everything.

The police caught thehit-and-run driver and he made a clean breast of his crime.

Arthurworried because he cheated on the test, and finally he went to theteacher and made a clean breast of it.

Compare: OFF ONE'S CHEST.