on the way out
1
About to go out, as in We were on our way out when the phone rang.
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2
Going out of fashion, becoming obsolete, as in Full-size cars are on their way out.
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The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.