deep, dark secret(redirected from one's deep dark secret)
deep, dark secret
A piece of information that is extremely private and confidential, usually implied to be embarrassing, incriminating, or shameful. I've carried my fear of clowns as a deep, dark secret for many years now. Many saw her as a perfect candidate, but no one could have known she had a deep, dark secret from her past.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.