quack

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quack1 / kwak/ • n. [in sing.] the characteristic harsh sound made by a duck.• v. [intr.] (of a duck) make this sound. ∎ inf. talk loudly and foolishly.quack2 • n. a person who dishonestly claims to have special knowledge and skill in some field, typically in medicine: [as adj.] quack cures. DERIVATIVES: quack·er·y / ˈkwakərē/ n.quack·ish adj.