One of the mysteries of the English language finally explained.
Representing the harsh sound characteristically made by a duck, or a noise resembling this.
Humorous and nursery. A duck.
Late 17th century; earliest use found in Edward Ravenscroft (fl. 1659–1697), playwright. Reduplication of quack.
quack quack/ˌkwak ˈkwak//ˈkwak ˌkwak/
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