um

interjection

1. Expression of confusion or space filler in conversation. See uh.

- Um, I don’t know.

- Let’s see... um... how about this?

2. (chiefly US) Dated spelling of mmm.

noun

1. Alternative spelling of µm

preposition

1. Alternative form of umbe

verb

1. (intransitive) To make the um sound to express confusion or hesitancy.