quack

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   The vocalisation made by a duck.

   • Did you hear that duck make a quack?

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   Of a duck, to make its characteristic vocalisation.

   • The more breadcrumbs I threw on the ground, the more they quacked.
   • Do you hear the ducks quack?
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   To make a sound similar to the quack of a duck.

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   Of a queen bee: to make a high-pitched sound during certain stages of development.intransitive

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   A duck's quack.

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   A fraudulent healer, especially a bombastic peddler in worthless treatments, a doctor who makes false diagnoses for monetary benefit, or an untrained or poorly trained doctor who uses fraudulent credentials to attract patientsderogatory

   • That doctor is nothing but a lousy quack!
   • 1662, Rump: or an Exact Collection of the Choycest Poems and Songs Relating to Late Times, Vol. II, by ‘the most Eminent Wits’ Tis hard to say, how much these Arse-wormes do urge us, We now need no Quack but these Jacks for to purge us, …
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   Any similar charlatan or incompetent professional.derogatoryfiguratively

   • The very quaik of faſhions, the very hee that / VVeares a Steletto on his chinne.
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   Any doctor.derogatoryhumorousmildly

   • That quack wants me to quit smoking, eat less, and start exercising. The nerve!

syn. snake-oil salesman · medicaster · quacksalver · pharmacopole

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   To practice or commit quackery (fraudulent medicine).

   • […] it is incredible, and scarce to be imagin’d, how the Posts of Houses, and Corners of Streets were plaster’d over with Doctors Bills, and Papers of ignorant Fellows; quacking and tampering in Physick, and inviting the People to come to t
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   To make vain and loud pretensions.obsolete

   • Seek out for Plants with Signatures To Quack of Universal Cures

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   Falsely presented as having medicinal powers.

   • Don't get your hopes up; that's quack medicine!