Definitions
1.SymbolAlternative form of μm.
2.InterjectionExpression of hesitation, uncertainty or space filler in conversation."Um, I don’t know.; Let’s see... um... how about this?"
3.InterjectionDated spelling of mmm.
4.InterjectionAn expression to forcefully call attention to something wrong."Um, excuse me!"
5.InterjectionAn expression of shocked disapproval used by a child who witnesses forbidden behavior.
6.VerbTo make the um sound to express uncertainty or hesitancy.
7.NounAn occurrence of the interjection "um".
8.ParticleAn undifferentiated determiner or article; a miscellaneous linking word, or filler with nonspecific meaning; representation of broken English stereotypically or comically attributed to Native Americans."Me be Injun. Him um Growling Bear. Him um heap big chief."