dine out on

Be invited to dinner because of something one knows about and can discuss. For example, “In a couple of years you will be dining out on this murder” (Ngaio Marsh, A Man Lay Dead, 1934). [First half of 1900s] Also see eat out; sing for one's supper.

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