Quack: meaning, definitions and examples

To refer to a fraudulent or incompetent person, especially in the medical field, carrying a negative connotation.

• Many people were deceived by the quack who claimed he could cure all ailments.
• Beware of quacks offering miracle cures online.

To describe the specific sound made by a duck in both casual and specific contexts, often highlighting the characteristic of the sound.

• The quack sound echoed through the valley.
• She imitated the quack sound perfectly.

To scientifically or specifically describe the sound that a duck makes, often used in formal descriptions or explanations.

• The duck noise is commonly heard near wetlands.
• Researchers recorded the duck noise early in the morning.

Used to describe someone who pretends to be a doctor or someone with medical knowledge but actually lacks the necessary qualification. This term carries a negative connotation.

• The so-called doctor turned out to be a quack, with no real medical training.
• Don't trust that quack; he's just trying to sell fake cures.

Refers to someone who pretends to have skills or knowledge that they do not actually possess, not necessarily limited to the medical field. This word has a negative connotation.

• The new self-help guru was exposed as a charlatan with no real experience.
• Many believed him to be a financial expert, but he was just a charlatan.

Describes a person who pretends to be someone else, often to deceive others for personal gain or to access restricted areas. This term can be used in a variety of contexts and generally has a negative connotation.

• The impostor was caught trying to enter the restricted area using a fake ID.
• After his arrest, it was revealed that he was an impostor posing as a company executive.