Synonyms of 'in passing'
▷ See passing
incidentallyDictionary, on the way, by the way
She only mentioned you in passing.
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The door cannot be opened accidentally.
in passing: in chess, said of capturing a pawn that has made an initial move of two squares to its fourth rank, bypassing the square where an enemy pawn on its own fifth rank could capture it. The capture is made as if the captured pawn had moved one square instead of two
He advised her, en passant, that she should see a doctor.
Thesaurus for in passing from the Collins English Thesaurus
If you mention something in passing , you mention it briefly while you are talking or writing about something else.