QUACK

quack. Quack, v.i. to cry like a duck, brag, physic

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Quack (?), v. i. [imp. & p. p. Qvacked (?); p. pr. & vb. n. Quacking.] [[Of imitative origin; cf. D. kwaken, G. quacken, quaken, Icel. kvaka to twitter.]] 1. 1. To utter a sound like the cry of a duck.
2. 2. To make vain and loud pretensions; to boast. “ To quack of universal cures.” Hudibras.
3. 3. To act the part of a quack, or pretender.