Definition of "um" []

• Used to express doubt or uncertainty or to fill a pause when hesitating in speaking. (interjection)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Further and further away we started finding some success.. however unfortunately.. for our um personal..um reasons.. those we chose not to stay at."
• "I will……um……..send…….um…….the ACLU a um, um Christmas card………um…..because…..um…….they exist?"
• "Lady: Uh .. um … well, I’m trying to … I mean, no ma’am there is no Lakisha here….um…."