quack ( quacks plural & 3rd person present) ( quacking present participle) ( quacked past tense & past participle )
1 n-count If you call someone a quack or a quack doctor, you mean that they claim to be skilled in medicine but are not.
oft N n (disapproval)
I went everywhere for treatment, tried all sorts of quacks.
2 adj Quack remedies or quack cures are medical treatments that you think are unlikely to work because they are not scientific.
ADJ n (disapproval)
3 verb When a duck quacks, it makes the noise that ducks typically make.
There were ducks quacking on the lawn. V
Quack is also a noun., n-count; sound
Suddenly he heard a quack.
Traducción diccionario Collins Inglés Cobuild
n charlatan, fake, fraud, humbug, impostor, mountebank, phoney or phony (informal) pretender, quacksalver (archaic)
adj counterfeit, fake, fraudulent, phoney or phony (informal) pretended, sham
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