Word forms: plural, 3rd person singular present tense quacks, present participle quacking, past tense, past participle quacked
1N-COUNT [oft NOUN n]庸医;江湖郎中;冒牌医生 If you call someone a quack or a quack doctor, you mean that they claim to be skilled in medicine but are not. 庸医;江湖郎中;冒牌医生 [disapproval]
I went everywhere for treatment, tried all sorts of quacks.
2ADJ [ADJ n]江湖医术;骗人的医术Quack remedies or quack cures are medical treatments that you think are unlikely to work because they are not scientific. 江湖医术;骗人的医术 [disapproval]
Why do intelligent people find quack remedies so appealing?
为什么聪明人会被江湖医术所吸引?
3VERB (鸭子)发出嘎嘎声 When a duck quacks, it makes the noise that ducks typically make. (鸭子)发出嘎嘎声