interjection Expression of hesitation, uncertainty or space filler in conversation.
Um, I don’t know.
interjection Dated spelling of mmm.
interjection An expression to forcefully call attention to something wrong.
Um, excuse me!
interjection An expression of shocked disapproval used by a child who witnesses forbidden behavior.
verb To make the um sound to express uncertainty or hesitancy.
noun An occurrence of the interjection "um".
particle An 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.