- the harsh, throaty cry of a duck or any similar sound.
- to utter the cry of a duck or a sound resembling it.
- a fraudulent or ignorant pretender to medical skill: Desperation for a cure led her to a quack who took her money.
- a person who pretends, professionally or publicly, to have skill, knowledge, or qualifications they do not possess; a charlatan.
- being a fraudulent or ignorant pretender to skills, especially medical skills: He's just a quack psychologist who complicates everyone's problems.
- presented falsely as having curative powers: quack medicine.
- of, relating to, or befitting a quack or quackery: Her quack methods have helped no one.
- to treat in the manner of a fraudulent or ignorant pretender to medical skill.
- to advertise or sell with fraudulent claims.
- (of a duck) to utter a harsh guttural sound
- to make a noise like a duck
- the harsh guttural sound made by a duck
- an unqualified person who claims medical knowledge or other skills
- (as modifier)
- a doctor; physician or surgeon
- to act in the manner of a quack
