- Um is defined as something you say to pause in a conversation or to show you're unsure.
An example of um is what you might say when a reporter asks you a question you're not sure you want to answer.
She might be saying "um".
um definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
uh (sense )
um definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Used to express doubt or uncertainty or to fill a pause when hesitating in speaking.