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

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 …

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.

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

3 days ago · Adjective quack (comparative more quack or quacker, superlative most quack or quackest) (quacker and quackest are rare, and probably used humorously) Falsely presented as having …

Quack Origin and History - Many people wrongly believe that 'quack' is slang for doctor. In fact, quack is not slang at all and is a term for a medical charlatan.

Nov 18, 2017 · 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 focus on health frauds, myths, fads, …

Sep 12, 2025 · The word “quack” isn’t just slang—it's a potent term used to identify deception, fraud, and unqualified practitioners. Whether you’re trying to spot a fake healthcare provider or understanding …