mention something in passingmention (someone/something) in passing
to refer to someone or something briefly while talking about something else.
During the interview, she mentioned in passing that her father had also been involved in publishing.
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mention (something) in passing
To say something, 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.
mention someone or something in passing
to mention someone or something casually; to mention someone or something while talking about someone or something else. He just happened to mention in passing that the mayor had resigned.John mentioned in passing that he was nearly eighty years old.