in clandestine
privately
secretly
in secret
confidentially
in secrecy
The planning board of the finance division constantly meets behind closed doors, in case its negotiations become known in advance.
A lot of meetings are held behind closed doors in order to prevent the public from knowing what is discussed.
My parents are having a lot of discussions behind closed doors. I think they know that I got into trouble at school.
In order to keep the winner of the contest a secret, the voting happened behind closed doors.
I don’t trust any discussion that happens behind closed doors. I believe that everyone should have a say.
You never know what is said behind closed doors. You might think that someone is your friend but they could be saying bad things about you.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.