welcome to, be
Be cordially or freely allowed to, as in You're most welcome to join us, or You're welcome to borrow my boat whenever you like. [1300s] Also see you're welcome.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.