n an untrained person who pretends to be a physician and who dispenses medical advice
n the harsh sound of a duck
v utter quacking noises
v act as a medical quack or a charlatan
abbr. quacksalvers 庸医, 骗子(16世纪习惯用水银或汞治疗梅毒的人)
n. <英>江湖医生( quack的名词复数 ); 江湖郎中; （鸭子的）呱呱声
v. （鸭子）发出嘎嘎声( quack的第三人称单数 )