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The definition of a quack is the sound a duck makes, or a person who claims to have a specific skilled that he does not have. An example of a quack is what you'll likely hear at a duck park. An example of a quack is a fake doctor. Quack is defined as to make the noise of a duck.
Definition of racket. 1  1 : confused clattering noise : clamor. 2  2a : social whirl or excitementb : the strain of exciting or trying experiences. 3  3a : a fraudulent scheme, enterprise, or activityb : a usually illegitimate enterprise made workable by bribery or intimidationc : an easy and lucrative means of livelihoodd slang : occupation, business.