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Meaning of echo question

ech'o ques"tion

Pronunciation: [key]
— Gram. Gram.
  1. a question uttered by a listener that in effect repeats a speaker's sentence, replacing an unclear or doubted portion of the sentence with a stressed interrogative word, as You said WHAT to John? or He WHAT?
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.