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 …

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 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 …

Discover the meaning of Quack, explore its usage in everyday language, popular idioms, and fun facts that make this word fascinating. Perfect for learners and curious minds!

Oct 27, 2025 · quack (third-person singular simple present quacks, present participle quacking, simple past and past participle quacked) To make a noise like a duck.

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

Quack definition: The characteristic sound uttered by a duck.