Defn: One whose business is to make sport for others; a buffoon; a zany; especially, one who attends a mountebank or quack doctor.
One who mounts a bench or stage in the market or other public place, boasts of his skill in curing diseases, and vends medicines which he pretends are infalliable remedies; a quack doctor.
As for his being a quack doctor, I see no great harm in that.
As a quack doctor he wanted the services of both Tim and myself in mixing up, making pills, &c.
As a quack doctor he wanted the services of both Tim and myself in mixing up, making pills, etcetera, and also in assisting him in persuading the public of his great skill.
As a mountebank, a juggler, a quack doctor--I spurned the very idea.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "quack doctor" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.