WordReference Random House Learner's Dictionary of American English © 2015
ˈo•pen ˈse•cret, n. [countable]
something that is supposed to be a secret but is actually known by others.

WordReference Random House Unabridged Dictionary of American English © 2015
open secret, 
something supposedly secret but actually known quite generally.
Etymology:1875–80


Collins Concise English Dictionary © HarperCollins Publishers::

open secret n
  1. something that is supposed to be secret but is widely known



'open secret' also found in these entries:
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