cry, shout, ἰάχοντες ἐπεσσύμεθʼ Od. 4.454, etc.; of battle-shouts, Ἀργεῖοι δὲ μέγα ἴαχον Il. 17.317; σμερδαλέα ἰάχων 19.41, Od. 22.81; shriek in alarm or pain, πρὸς κόλπον . . τιθήνης ἐκλίνθη ἰάχων Il. 6.468, cf. 5.343, Od. 10.323; δμῳαὶ . . θυμὸν ἀκηχέμεναι μεγάλʼ ἴαχον Il. 18.29; γοηρὸν ἴαχεν Epigr.Gr. 790.7 (Dyme, iii B.C.): sts. of articulate speech, of a herald, E. El. 707 (lyr.); of the ship Argo, A.R. 4.581, 592, cf. AP 5.298.10 (Agath.).
of things, ring, resound, of an echo, περὶ δʼ ἴαχε πέτρη Od. 9.395, cf. Il. 21.10, Limen. 15; of waves, ἀμφὶ δὲ κῦμα στείρῃ . . μεγάλʼ ἴαχε Il. 1.482, Od. 2.428, cf. Il. 2.394; of fire, roar, 23.216; of a bowstring, twang, 4.125; of hot iron in water, hiss, Od. 9.392; of a struck shield, Hes. Sc. 232; also μέλαθρον ὑπὸ μολπᾶς ἴαχεν AP 7.194 (Mnasalc.).
c. acc. cogn., ἰ. μέλος sound forth a strain, Call. Cer. 40; ἄνδρες ἐπήρατον ἴαχον ὄρθιον Sapph. 44.32 L.-P.; [λογίων ὁδόν] τινι proclaim it to him, Ar. Eq. 1016: c. acc.pers., sound oneʼs praises, ἴαχον Ἀπόλλω were sounding his praises, Id. Av. 772; με Νεμέα ἴαχεν ἀθλοφόρον Epigr.Gr. 932 a.—Ep. only 3 sg. and pl. impf. and part.: pres. ἰάχει E. El. 707: pf. only in part. of the compd. ἀμφιαχυῖα (q. v.): ἰαχέω (q. v.) is commoner in Att. Poets. (ϝιϝάχω, cf. Od. 4.454, al.; when ϝ is observed ι i