不及物动词

名词

1. 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.

2. 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.

3. (鸭子)发出嘎嘎声
When a duck quacks, it makes the noise that ducks typically make.

1. the harsh sound of a duck

2. an untrained person who pretends to be a physician and who dispenses medical advice