a doormat, especially one with the word “welcome” printed on it.
put out the welcome mat, to extend a hearty welcome: The club put out the welcome mat for new members.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
A friendly welcome, as in They put out the welcome mat for all new members. This expression alludes to a doormat with the word “Welcome” printed on it. [Mid-1900]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.