in passing
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.
in passing
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.
in passing
Incidentally, by the way, as in "It may be remarked in passing" (Charlotte Brontë, Shirley, 1849). [Mid-1800s]
in ˈpassing
done 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...? in passing
While going by; incidentally.