let alone

let alone idiom
  1. See leave someone alone.
  2. Not to mention, as in We have no room for another house guest, let alone an entire family. [c. 1800]

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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