english
1
general::
Confess everything, as in If you come clean about what happened I will promise to keep it to myself. [Slang; early 1900s]
American Heritage Idioms
2
general::
Phrase(s): come clean (with someone) (about something) Fig. to be honest with somebody about something. • I want you to come clean with me about your financial status. • Sam will come clean with me. I know he will.
McGrawhill's American Idioms And Phrasal Verbs