Quacks are people who are trying to sell something that is not really effective or that is dangerous. They often try to sell their products to people who don't really need them.
The quack is selling a useless product.
The quack is selling a dangerous product.
verb
act as a medical quack or a charlatan
noun
an untrained person who pretends to be a physician and who dispenses medical advice
adjective
medically unqualified
noun
the harsh sound of a duck
verb
utter quacking noises
1
Next he became a quack doctor and soothsayer.
2
The girl was quacking in cold.
3
Brown was actually a swindler and quack.
4
People found the source of quacks.
5
Suddenly, the duck stopped quacks.
6
He was annoyed by loud quacks.
7
He heard quacks at night.
8
The sound of quack scared people.
9
This is the quack and the conduct of this man is quackery.
10
Where is this quack coming from