The meaning of QUACK is to make the characteristic cry of a duck. How to use quack in a sentence.

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Jan 20, 2026 · Adjective quack (comparative more quack or quacker, superlative most quack or quackest) (quacker and quackest are rare, and probably used humorously) Falsely presented as …

QUACK definition: 1. to make the usual sound of a duck: 2. a person who dishonestly pretends to have medical skills…. Learn more.

QUACK definition: the harsh, throaty cry of a duck or any similar sound. See examples of quack used in a sentence.

A quack is a "fraudulent or ignorant pretender to medical skill" or "a person who pretends, professionally or publicly, to have skill, knowledge, qualification or credentials they do not possess; a charlatan or …

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A quack is, by derivation, one who talks much without wisdom, and, specifically, talks of his own power to heal ; hence, any ignorant pretender to medical knowledge or skill.