Definition of mouthful noun from the Oxford Advanced American Dictionary

     

    mouthful

     noun
    noun
    NAmE//ˈmaʊθfʊl//
     
     
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  1. 1[countable] an amount of food or drink that you put in your mouth at one time She took a mouthful of water. Thank you, but I couldn't eat another mouthful. He talked eagerly between mouthfuls of salad.
  2. 2 [singular] (informal) a word or a phrase that is long and complicated or difficult to pronounce My name's Zacharias. You can call me Zach if it's too much of a mouthful. Dr. Solomon's Anti-Virus Toolkit for Windows (what a mouthful!)
  3. Idioms
    say a mouthful(informal)
     
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    to say something important using only a few words You said a mouthful there, buddy.
See the Oxford Advanced Learner's Dictionary entry: mouthful