Quack is the rather silly noise that a duck makes.[1]

Quack is also a term for a deceitful person who pretends to be an expert in some field, especially medicine but doesn't really know very much and makes preposterous claims. A quack may also be someone who knows a great deal and makes preposterous claims to deceive people.[2]

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  1. "Quack". (April 2013). Wiktionary. Retrieved May 13, 2013.
  2. "Quack". (April 2013). Wikipedia. Retrieved May 13, 2013.