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:
“The child ... stands upon a place apart, a little spectator of the world, before whom men and women come and go, events fall out, years open their slow story and are noted or let go as his mood chances to serve them. The play touches him not. He but looks on, thinks his own thought, and turns away, not even expecting his cue to enter the plot and speak. He waits,—he knows not for what.”
—Woodrow Wilson (1856–1924)
“The secret of ugliness consists not in irregularity, but in being uninteresting.”
—Ralph Waldo Emerson (1803–1882)