quack


From The Collaborative International Dictionary of English v.0.48:

Quack \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.]
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   1. To utter a sound like the cry of a duck.
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   2. To make vain and loud pretensions; to boast. " To quack of
      universal cures." --Hudibras.
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   3. To act the part of a quack, or pretender.
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From The Collaborative International Dictionary of English v.0.48:

Quack \Quack\, n.
   1. The cry of the duck, or a sound in imitation of it; a
      hoarse, quacking noise. --Chaucer.
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   2. [Cf. Quacksalver.] A boastful pretender to medical
      skill; an empiric; an ignorant practitioner.
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   3. Hence, one who boastfully pretends to skill or knowledge
      of any kind not possessed; a charlatan.
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            Quacks political; quacks scientific, academical.
                                                  --Carlyle.
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From The Collaborative International Dictionary of English v.0.48:

Quack \Quack\, a.
   Pertaining to or characterized by, boasting and pretension;
   used by quacks; pretending to cure diseases; as, a quack
   medicine; a quack doctor.
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