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:
“What is reality?
I am a plaster doll; I pose
with eyes that cut open without landfall or nightfall
upon some shellacked and grinning person,
eyes that open, blue, steel, and close.
Am I approximately an I. Magnin transplant?”
—Anne Sexton (1928–1974)
“Euphemisms are not, as many young people think, useless verbiage for that which can and should be said bluntly; they are like secret agents on a delicate mission, they must airily pass by a stinking mess with barely so much as a nod of the head, make their point of constructive criticism and continue on in calm forbearance. Euphemisms are unpleasant truths wearing diplomatic cologne.”
—Quentin Crisp (b. 1908)