Meaning of “quack” in the English Dictionary

(Definition of “quack” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"quack" in American English

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quackverb [ I ]

us /kwæk/

quack verb [ I ] (SOUND)

to make the sound ducks make:

The ducks started quacking.

quacknoun [ C ]

us /kwæk/

quack noun [ C ] (FALSE DOCTOR)

(Definition of “quack” from the Cambridge Academic Content Dictionary © Cambridge University Press)