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

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

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.

Apr 15, 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 definition: The characteristic sound uttered by a duck.

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.

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

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

Pertaining to or characterized by quackery of any kind; specifically, falsely pretending to cure disease, or ignorantly or fraudulently set forth as remedies: as, a quack doctor; quack medicines.