come clean (about something)
/ˌkʌm ˈkliːn/idiom
to tell the truth about something you have kept secret
признаться, выложить всю правду
Русский аналог: «сознаться»
Come clean about something или with someone: He finally came clean about the money.
“He finally came clean about breaking the window.”
“It’s time to come clean and tell her everything.”
“The company came clean about the data leak.”