au passage

along the way

→ au
phrase Rare #46,930
along the way Can also be used as a conversational aside, meaning “by the way.”
FR: Au passage, peux-tu acheter du pain ?
EN: By the way, can you buy some bread?

Dis à Tom et Marie que je les prendrais au passage.

Tell Tom and Marie that I’d pick them up on the way.

Au passage, as-tu des piles de rechange ?

By the way, do you have any spare batteries?

Jette ça au passage.

Throw that out while you're at it.

— Une Affaire de famille (2018)

Au passage, il prend aussi un peu d'argent.

While he’s at it, he also takes a little money.

— The Garden of Sinners, film 5 : Spirale contradictoire (2008)

Au passage, apporte-moi un Cutty Sark.

While you're at it, bring me a Cutty Sark.

— Les Affranchis (1990)