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 …

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

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

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 …

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, fallacies, …

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

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 …

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

quackery, the characteristic practice of quacks or charlatans, who pretend to knowledge and skill that they do not possess, particularly in medicine. The quack makes exaggerated claims about his or her …