1. Expression of confusion or space filler in conversation. See uh.
- Um, I donâ€™t know.
- Letâ€™s see... um... how about this?
2. (chiefly US) Dated spelling of mmm.
1. Alternative spelling of Âµm
1. Alternative form of umbe
1. (intransitive) To make the um sound to express confusion or hesitancy.