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Definition of quack noun from the Oxford Advanced American Dictionary

     

    quack

     noun
    noun
    NAmE//kwæk//
     
     
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  1. 1the sound that a duck makes
  2. 2(informal) (disapproving) a person who dishonestly claims to have medical knowledge or skills quack doctors and their remedies She exposed Dr. Jones as a quack.
See quack in the Oxford Advanced Learner's Dictionary
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