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.

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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.

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

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 …

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.

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 …

Quack definition: The characteristic sound uttered by a duck.