Meaning of the word "open secret" in English

What does "open secret" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

open secret

US /ˈoʊpən ˈsiːkrət/
UK /ˈoʊpən ˈsiːkrət/
"open secret" picture

Noun

1.

a fact that is supposed to be secret but is actually known by many people

Example:
It's an open secret that they are planning to get married.
His affair with his assistant was an open secret in the office.
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