ὑψηχής
From LSJ
Έγ', ὦ ταλαίπωρ', αὐτὸς ὧν χρείᾳ πάρει. Τὰ πολλὰ γάρ τοι ῥήματ' ἢ τέρψαντά τι, ἢ δυσχεράναντ', ἢ κατοικτίσαντά πως, παρέσχε φωνὴν τοῖς ἀφωνήτοις τινά –> Wretched brother, tell him what you need. A multitude of words can be pleasurable, burdensome, or they can arouse pity somehow — they give a kind of voice to the voiceless.
English (LSJ)
ές, (ἦχος)
A making a loud or ringing sound, ὑψηχέες ἵπποι, because of their loud neighing, or their 'high-resounding pace' (cf. ἐρίγδουπος), Il.5.772 (v.l. ὑψαύχενες ap.Longin.), 23.27; τὸ ὑ. τῶν λόγων Philostr. VS1.25.7.