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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?”