Meaning of the word "in passing" in English

What does "in passing" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

in passing

US /ɪn ˈpæsɪŋ/
UK /ɪn ˈpɑːsɪŋ/

Phrase

briefly and without going into detail; incidentally

Example:
He mentioned in passing that he was moving to another city.
I just wanted to ask in passing if you'd seen my keys.