quack

adjective

  1. 1

    medically unqualified

    a quack doctor

noun

  1. 1

    the harsh sound of a duck

  2. 2

    an untrained person who pretends to be a physician and who dispenses medical advice

verb

  1. 1

    act as a medical quack or a charlatan

  2. 2

    utter quacking noises

    The ducks quacked

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