Echo.
The Romans say that Echo was a nymph in love with Narcissus, but her love not being returned, she pined away till only her voice remained. We use the word to imply similarity of sentiment: as You echo my ideas; That is an echo to my opinion.
“Sweet Echo, sweetest nymph, that liv’st unseen
Within thy airy shell,
Milton: Comus, 230, etc.
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