mug - definition and synonyms

noun [countable] 

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  1. 1
    a cup with straight sides and no saucer, used mainly for hot drinks

    a coffee mug

    1. b.
      the liquid in a mug, or the amount that a mug contains

      Nina had made mugs of tea for them both.

  2. 2
    informal someone who does not realize that they are being tricked or treated badly

    Only a mug would pay those prices.

  3. 3
    informal someone’s face