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N-COUNT
庸醫(yī)；江湖郎中；冒牌醫(yī)生
If you call someone a quack or a quack doctor, you mean that they claim to be skilled in medicine but are not.
例句
I went everywhere for treatment, tried all sorts of quacks.
我四處求醫(yī)，看過了各種各樣的江湖郎中。
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ADJ
江湖醫(yī)術(shù);騙人的醫(yī)術(shù)
Quack remedies or quack cures are medical treatments that you think are unlikely to work because they are not scientific.
例句
Why do intelligent people find quack remedies so appealing?
為什么聰明人會(huì)被江湖醫(yī)術(shù)所吸引？
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VERB
(鴨子)發(fā)出嘎嘎聲
When a duck quacks, it makes the noise that ducks typically make.
例句
There were ducks quacking on the lawn.
草地上有幾只鴨子在嘎嘎叫。