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English definition of “quack”

quack

verb [I] uk   /kwæk/ us  
to make the usual sound of a duck: The ducks started quacking loudly when we threw them some bread.

quack

noun [C] uk   /kwæk/ us  

quack noun [C] (PERSON)

disapproving a person who dishonestly pretends to have medical skills or knowledge UK informal often disapproving a doctor: Have you seen a quack about that cough?

quack noun [C] (SOUND)

[C] the sound that a duck makes
(Definition of quack from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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