on the way out
About to go out, as in We were on our way out when the phone rang.
Going out of fashion, becoming obsolete, as in Full-size cars are on their way out.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.