To Quack. v.n. [quacken, Dutch, to cry as a goose.]
- To cry like a duck. This word is often written quaake to represent the sound better.
Wild-ducks quack where grasshoppers did sing. King.
- To chatter boastingly; to brag loudly; to talk ostentatiously.
Believe mechanick virtuosi
Can raise them mountains in Potosi,
Seek out for plants with signatures,
To quack of universal cures. Hudibras, p. iii.