Idioms and Phrases with behind closed doors
behind closed doors
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® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.