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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!