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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.
(kwÃ¦k ) Word forms: plural , 3rd person singular present tense quacks , present participle quacking , past tense , past participle quacked. 1. countable noun [oft NOUN noun] If you call someone a quack or a quack doctor, you mean that they claim to be skilled in medicine but are not. [disapproval] I went everywhere for treatment, tried all sorts of quacks.