ˈʌm 
or a prolonged m sound
—used when you hesitate because you are not sure about what to say
"Are you coming to the party?" "Um, I think so."
Cite this Entry
“Um.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/um. Accessed 23 Jun. 2026.
Copy Citation
