quack

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Related to quacks: quacksalver, Quack medicine

If it looks like a duck and walks/quack/flies etc. like a duck, it is a duck.

  (humorous)
used to say that something is probably exactly what it seems to be and we should trust our judgment about it They're calling it a clinic, not a prison, but if it looks like a duck and swims like a duck, then it is a duck, I think.
See also: and, duck, if, like, look, walk

quack

n. a fraudulent physician; a derogatory term for a physician. I won’t go back to that quack ever again!
References in periodicals archive ?
He said that illegal store owners and quacks were playing with the lives of the people and they would be dealt with an iron hand.
When rains block the muddy paths disrupting the access of the villagers to health workers, quacks that operate in the vicinity are the sole source of help.
A separate category is of dentist quacks that can be seen running their shops and stalls in various parts of Lahore, especially the walled city and public places including railway station, general bus stand and Data Darbar etc.
The scientists' conclusion was that a duck's quack definitely echoes just like any other sound, but you might not notice it.
The Commission's decision affirmed the ALJ's holding that the AquaDuck(R) line of Quacks shoes does not infringe Crocs' design patent while leaving the remaining respondents to continue to defend their designs against Crocs' attack.
The quack has long been a popular and profitable subject for artists in Europe and the United States," notes John Ittmann, Curator of Prints at the Philadelphia Museum of Art.
A UNIVERSITY professor has scotched the myth that a quack doesn't echo with the help of a farmyard duck calledDaisy.
Another reason why the belief might have grown that quacks do not echo is that ducks are normally found in open-water areas.
In most scenarios, the feathered icon belts out its signature quack to unsuspecting passersby as individuals converse about insurance.
Although a homeopathic practitioner may be a seasoned expert in his or her field, the absence of widespread homeopathic legislation helps discredit its practice and creates more room for quacks.
Quacks may lure the seriously and often desperately ill, such as people suffering from arthritis and cancer, into buying a bogus cure.
A streak of quacks can be seen doing their business of extracting teeth in the areas of Bagirji village, Bachal Shah, New Goth, Kandhra, Sultanpur and other vicinities.
Islamabad -- Federal Interior Minister Chaudhry Nisar Ali Khan has directed Islamabad administration to take stern action against the quacks, illegal clinics and contraband drugs and warned no slackness in this respect will be tolerated.
IT has been bad news for quacks ever since Aam Aadmi Party ( AAP) has come to power in Delhi.
Karachi, May 1(ANI): As many as 6,00,000 quacks are operating all over Pakistan, while 70,000 to 80,000 are present in Karachi alone.