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:
“It will open a door through which fools and fanatics will pour in, and make the cause ridiculous.”
—Jane Grey Swisshelm (1815–1884)
“Freud is all nonsense; the secret of neurosis is to be found in the family battle of wills to see who can refuse longest to help with the dishes. The sink is the great symbol of the bloodiness of family life.”
—Julian Mitchell (20th century)