behind closed doors

behind closed doors idiom
In secret, privately. For example, The nominating committee always meets behind closed doors, lest its deliberations become known prematurely. Also see behind the scenes.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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