1. Expression of hesitation, uncertainty or space filler in conversation. See uh.
    Um, I don’t know.
    Let’s see... um... how about this?
    • 2002, Newsweek (volume 140, page lxxx)
      It's a great test of the claims of open-source gurus, who say that a self-motivated community can outcode any team working for a single employer—like, um, Microsoft.
  2. (chiefly, American) Dated spelling of mmm#English|mmm.
    • 1963, Kurt Vonnegut, Cat's Cradle, Dell Publishing Co., Inc., page 65:
      "About the same, wherever you go," he agreed.
      "Um," I said.

um (ums, present participle umming; past and past participle ummed)

  1. (intransitive) To make the um sound to express uncertainty or hesitancy.
  1. Alternative form of umbe

um (plural um)

  1. Alternative spelling of µm
  1. (dated, sometimes, humorous, often, offensive) 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.
    He um Growling Bear. He um heap big chief.

Proper noun
  1. Initialism of University of Miami
  2. Initialism of University of Michigan

um (plural ums)

  1. (philately) Initialism of unmounted mint

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