Definition - A figure of speech where you claim to be saying the words that an absent or imaginary person would have said.

Example -
You know what Quintilian would say if he were here. I'll tell ya. He'd say: "That ain't no rhetorical question, buddy." It sure as hell ain't.

Etymology -
The word derives from the Greek prosopopoiia, the putting of speeches into the mouths of others (from prosopon, dramatic character).

Oxford English Dictionary -
Its first citation is from 1561:
"We understand these things to be spoken by a figure called Prosopopeia: that is, by the fayning of a person."
(J. Daus tr. Bullinger on Apoc. (1573) 91)

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