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Casually or as an aside during a conversation. It wasn't the main focus of our discussion—he only mentioned it in passing. Karen mentioned the party in passing the other day, but she didn't go into detail.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
casually; said or mentioned as an aside. I just heard your name in passing. I didn't hear more than that. The lecturer referred to George Washington in passing.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
Incidentally, by the way, as in "It may be remarked in passing" (Charlotte Brontë, Shirley, 1849). [Mid-1800s]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
in ˈpassingdone or said while you are giving your attention to something else: ‘What did the minister say about educational reform?’ ‘Not very much. He just mentioned it in passing.’ ♢ Could I just say in passing that...?
Farlex Partner Idioms Dictionary © Farlex 2017
While going by; incidentally.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.