closed door

closed door idiom
  1. An obstacle or restriction, as in There are no closed doors in the new field of gene therapy. [First half of 1900s]
  2. close one's doors. See close down. Also see behind closed doors; close the door.

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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