umm

Interjection

1. Expression of hesitation, uncertainty or space filler in conversation.
   • Um, I don’t know.

   Synonyms:

   er, hmm, uh, eh

2. (US) Dated spelling of mmm.
   • "About the same, wherever you go," he agreed.
     "Um," I said.1963, Kurt Vonnegut, Cat's Cradle, Dell Publishing Co., Inc., page 65
3. An expression to forcefully call attention to something wrong.
   • Um, excuse me!
4. (childish) An expression of shocked disapproval used by a child who witnesses forbidden behavior.
   • While I was in her room, Sam walked by and said, “Um, I'm telling!”
     “You're telling what?” I asked.
     “You're reading Tori's journal,” she said.2011, Kimberly Willis Holt, Piper Reed: Clubhouse Queen, page 83

See all 8 meanings of um