show someone the door - Phrases/Idioms
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.
Order someone to leave, as in I never should have listened to him; I should have shown him the door at once. This expression, first recorded in 1778, is not the same as show someone to the door (see under show someone out).