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 …

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.

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

quack 2 (kwæk) n. 1. a fraudulent pretender to medical skill. 2. a person who pretends, professionally or publicly, to skill, knowledge, or qualifications he or she does not possess; a …

Dec 2, 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 …

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 definition: The characteristic sound uttered by a duck.

Definition of quack noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.