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1. Please repeat that, I couldn't hear or didn't understand it. A: "We're going to France this summer." B: "Say what?" A: "France! We're going to France this summer!" B: "Oh, sorry, I thought you said you were going to Fran's, as in my friend Fran from New Orleans."
2. That's ridiculous; that can't be true or correct. A: "John quit his job to be a clown in the circus." B: "Say what? But he was earning, like, $100,000 a year!"
Inf. What did you say?; Please repeat what you said. Sally: Would you like some more salad? Fred: Say what? Sally: Salad? Would you like some more salad? John: Put this one over there. Sue: Say what? John: Never mind, I'll do it.
say ˈwhat?(American English, spoken) used to express surprise at what somebody has just said: ‘He’s getting married.’ ‘Say what?’
interrog. What did you say? The old man held his hand to his ear and said, “Say what?”