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show someone out

Also, show someone to the door. Escort someone who is leaving to the exit door, as in Thanks for coming; please excuse me for not showing you out, or Please show Mr. Smith to the door. [Second half of 1700s] Also see see out, def. 1; show someone the door.

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.