says who?

Idioms  

1. Who claims the truth of this statement, which I don't believe? For example, That horse of your will never win a race.—Says who? This slangy expression of disagreement or disbelief may also be put in declarative form, says you!, meaning “I disagree with what you just said.” For example, It was an accident, I didn't mean to break it.—Says you! You've always hated that vase. [First half of 1900s]

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Example Sentences

It was those same boys, Robertson says, who often had nothing to say when she sped across the finish line in front of them.

From BBC

As if she’s read my mind, Bubbe says, ‘Who do you think he played with the rest of the week?’

From Literature

He looks at the miserable elders, many of whose heads are bowed in shame, and says, “Who is ready to accept baptism?”

From Literature

Potash prices are expected to rise this year rather than decline, the analyst says, who estimates that most potash producers are running a near capacity until at least 2028.

From The Wall Street Journal

“It was surreal, it was like telling people they won the lottery. There was absolute shock,” Moreno says, who helped hand out the bonuses.

From The Wall Street Journal