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Related to in passing: for the most part, roughshod, in favor of, set out, refer to
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.
Incidentally, by the way, as in "It may be remarked in passing" (Charlotte Brontë, Shirley, 1849). [Mid-1800s]
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...?
While going by; incidentally.