“Well, Watson, what do you make of it?”
Arthur Conan Doyle, The Hound of Baskervilles
But, tell me, Watson, what do you make of our visitor’s stick?
Arthur Conan Doyle, The Hound of Baskervilles
How did you know what I was doing?
Arthur Conan Doyle, The Hound of Baskervilles
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Dictionary
Merriam-Webster
— used as an interrogative expressing inquiry about the identity, nature, or value of an object or matter
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Macmillan
— which thing
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Usage
210 uses of ‘what’ in The Hound of the Baskervilles, by Arthur Conan Doyle