An open secret is a concept or idea that is "officially" secret or restricted in knowledge, but is actually widely known; or refers to something which is widely known to be true, but which none of the people most intimately concerned are willing to categorically acknowledge in public.
Famous quotes containing the words open and/or secret:
““Where is the Mississippi panorama
And the girl who played the piano?
Where are you, Walt?
The Open Road goes to the used-car lot.”
—Louis Simpson (b. 1923)
“Like other secret lovers, many speak mockingly about popular culture to conceal their passion for it.”
—Mason Cooley (b. 1927)