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

The meaning of QUACK is to make the characteristic cry of a duck. How to use quack 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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QUACK definition: 1. to make the usual sound of a duck: 2. a person who dishonestly pretends to have medical skills…. Learn more.

If you call someone a quack or a quack doctor, you mean that they claim to be skilled in medicine but are not.

Dec 14, 2025 · quack (third-person singular simple present quacks, present participle quacking, simple past and past participle quacked) To make a noise like a duck. The more breadcrumbs I threw on the …

quack (kwæk) vb (intr) 1. (of a duck) to utter a harsh guttural sound 2. to make a noise like a duck

Quackwatch, which is operated by Stephen Barrett, M.D., is a network of Web sites and mailing lists maintained by the Center for Inquiry (CFI). The sites fo ...

Quack definition: The characteristic sound uttered by a duck.