quack

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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 ?
The reader is given some of the history of late 1800s and 1900s quackery with a few respectable scientists inadvertently adding their names to that ignoble gallery.
The meeting was told that the council had decided to join hands with the district and provincial authorities, the Pakistan Medical Association (PMA) and both electronic and print media to ensure an effective drive against quackery in Pakistan.
When the Pakistan Muslim League-N government was formed in 2008 in Punjab, a vigorous campaign was launched against quackery all over the province.
Its most provocative claim--announced in the title and insistently pressed in the introduction but mentioned only intermittently thereafter--is that although qualified physicians reinforced "male-imposed gender boundaries" by likening female healers to "whores, freaks, monsters or witches" (10), itinerant women performers nonetheless "actively contributed to the healthcare economy by selling medical goods and services" through their theatrical quackery (8), and even functioned as medical social workers avant le lettre by deploying "extensive one-to-one counseling skills" (9).
In 1984, he received an FDA Commissioner's Special Citation Award for Public Service in fighting nutrition quackery.
Of special note are the author's practical suggestions for finding a competent therapist and avoiding mental health business quackery.
Today's farmer will be quick to resent and resist quackery or unscientific products or services claims.
I could not believe the amount of misinformation, 'magic cures' and plain quackery that was forced on these poor gullible, intensely unhappy patients and their behaviourly challenged children.
The novel also provides an interesting look at the medical treatments of the times, when quackery abounded.
This was not just quackery but a key ingredient in understanding Himmler's wild schemes to re-people Europe and Germany itself with a new Aryan race rooted in the pure but imagined past as discovered by the Ahnenerbe.
Discuss how quackery affects the American public, and how this type of consumerism is dangerous to our health.
The efforts to shame gay men and lesbians into changing their sexuality, combined with the quackery that these conversion therapists use, needs to be exposed and renounced.
QUACKERY is not the kind of medical practice that pharmaceutical manufacturers might expect the World Health Organisation (WHO) to promote, but facing sub-Saharan Africa's ever-increasing AIDS/HIV emergency, it will use any resource.
Let's face it, we're a mess, too easily seduced by will-o'-the-wisp promises of salvation through fundamentalist religion, dogmatic political ideologies, post-modern quackery, voodoo economics, the so-called Free Market, or that 20th century contradiction in terms, sustainable development, (to name, as Gore Vidal might say, but a few).