Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “quack”

quack

verb [I] uk   /kwæk/ us  
to make the usual sound of a duck: The ducks started quacking loudly when we threw them some bread.Animal (non-human) sounds

quack

noun [C] uk   /kwæk/ us  

quack noun [C] (PERSON)

disapproving a person who dishonestly pretends to have medical skills or knowledgeFaking and pretendingDoctors and health workers generally UK informal often disapproving a doctor: Have you seen a quack about that cough?Doctors and health workers generally

quack noun [C] (SOUND)

[C] the sound that a duck makesAnimal (non-human) sounds
(Definition of quack from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of quack?
Add Cambridge dictionaries to your browser to your website

Definitions of “quack” in other dictionaries

Word of the Day

knack

a skill or an ability to do something easily and well

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More