quack: Meaning and Definition of

quack

1. to utter the cry of a duck or a sound resembling it.

quack

1. being a quack: a quack psychologist who complicates everyone's problems.
2. presented falsely as having curative powers: quack medicine.
3. of, pertaining to, or befitting a quack or quackery: quack methods.

1. to treat in the manner of a quack.
2. to advertise or sell with fraudulent claims.