συνεπιφθέγγομαι

A. reinforce one's utterance, Id. Tim. 27; ὁ αὐλὸς ς. τῷ παιᾶνι τὸ θεῖον sounds it with . ., Id. 2.713a.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
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