There are 2 definitions of quack in English:

quack1

Syllabification: quack
Pronunciation: /kwak
 
/

noun

[in singular]
The characteristic harsh sound made by a duck.
More example sentences
  • But even from the vague hints he throws out, I think we may rest assured it will not be the last quack of a lame duck.
  • This is an interesting link for anyone who was wondering about those duck quacks.
  • I'm sorry to say that it's not true about the quack of a duck.

verb

[no object] Back to top  
1(Of a duck) make a characteristic harsh sound.
More example sentences
  • Yet, in case after case, the chicken always ended up dead, while the duck went happily quacking down the river.
  • We strolled up a steep street, where wild ducks quacked for food outside a shop, and into a quiet garden.
  • Down near the pond, the ducks were quacking at an old couple that was throwing pieces of stale bread at them.
1.1 informal Talk loudly and foolishly.
More example sentences
  • Ever since Ride the Ducks came to town, I've watched those vessels drive by, its frenzied tourists quacking away.
  • Some of these remedies have been closer to quack concoctions.

Origin

mid-16th century (as a verb): imitative.

Definition of quack in:

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Pronunciation: əˈpilēən
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There are 2 definitions of quack in English:

quack2

Syllabification: quack
Pronunciation: /kwak
 
/

noun

A person who dishonestly claims to have special knowledge and skill in some field, typically in medicine: [as modifier]: quack cures
More example sentences
  • As with most quack cure claims about ‘toxins’, the actual toxins were not named.
  • An alternative medicine quack reckoned he could cure Faulkner of his twitching with a six-month course of treatment.
  • But why wouldn't they believe the claims of the detox quacks?
Synonyms

Origin

mid 17th century: abbreviation of earlier quacksalver, from Dutch, probably from obsolete quacken 'prattle' + salf, zalf (see salve1).

Derivatives

quackery

Pronunciation: /ˈkwakərē/
noun
More example sentences
  • The Skeptic's Dictionary is a compendium of detailed information about oft-repeated hoaxes, legends and quackery.
  • Why did this quackery get so far before being exposed?
  • Alarm made him listen to all manner of quackery.

quackish

adjective
More example sentences
  • Barrett goes on to describe the history of naturopathy and to list some of the quackish practices that have been included in naturopathy.
  • Obviously, Paul, anyone stupid enough to take your quackish advice deserves their outcomes.

Definition of quack in: