See leave someone alone.
Not to mention, as in We have no room for another house guest, let alone an entire family. [c. 1800]
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Question 1 of 7
What does “clement” mean?
Words nearby let alone
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.