come clean with someone about something

come clean with (someone) about (something)

To admit something to someone, often regarding a wrongdoing that one has tried to hide. We have to come clean with the police about what we did before Joe gets punished for our crime! The kids finally came clean with me about eating the cookies I'd made for the bake sale.
See also: clean, come
Farlex Dictionary of Idioms.

come clean (with someone) (about something)

in. to admit (something) to someone. You’re gonna have to come clean eventually.
See also: clean, come, someone, something
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • blow the whistle (on) (someone), to
  • clean as a hound's tooth
  • (as) clean as a hound's tooth
  • blue code of silence
  • blue wall of silence
  • code
  • silence
  • wall of silence
  • clean hands, have
  • whistle-blower