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 ?
Information from Daisy quacking in the echoless anechoic chamber was used to produce a computer model of what she would sound like flying past a cliff face.
Aflac's duck is not only quacking its way into advertising history, it's catapulting the company's insurance sales to record numbers.
As the call of "Jama-QuackQuack-Quack" fills the air, they will be led to their freedom one by one until, alas, the last lonely bird, bent over holding its ankles with eyes closed, moves to the rear quacking and is led by the sweet song of jama-quackery to safety.
They're always quacking," I said, putting a finger on the story I was reading so I wouldn't lose my place.
known for its quirky advertisements featuring a duck quacking about supplemental insurance, is setting its sights on the indemnity dental market.