QUACK, v.i. 1. To cry like a duck or goose.2. To boast; to bounce; to talk noisily and ostentatiously; as, pretenders to medical skill quack of their cures.QUACK, n. [from the verb.] 1. A boaster; one who pretends to skill or knowledge which he does not possess.2. A boastful pretender to medical skill which he does not possess; an empiric; an ignorant practitioner.
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