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English definition of “quack”

quack

verb [I]  /kwæk/ us  

quack verb [I] (SOUND)

to make the sound ducks make: The ducks started quacking.

quack

noun [C]  /kwæk/ us  

quack noun [C] (FALSE DOCTOR)

a person who falsely pretends to have medical skills or knowledge
(Definition of quack from the Cambridge Academic Content Dictionary © Cambridge University Press)
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