An open secret is a concept or idea that is `officially` secret or restricted in knowledge but is actually widely known; or it refers to something that is widely known to be true but which none of the people most intimately concerned is willing to categorically acknowledge in public. ==Popular examples== ===Government and military=== One famous ..... Found on http://en.wikipedia.org/wiki/Open_secret
noun something that is supposed to be secret but is generally known; `their love affair was an open secret` Found on https://www.encyclo.co.uk/local/20974