What does the word quack mean?

Usage examples for quack

  1. She began to quack, and made for the water, as ducks do, and swam to a far distance. – Fairy Tales of the Slav Peasants and Herdsmen by Alexander Chodsko
  2. Do you size him up as capable or as something of a quack? – The Bells of San Juan by Jackson Gregory
  3. If I were to tell you how I cured that young lady, you would take me for a quack. – The Country Doctor by Honore de Balzac

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