= ἰάχω, cry, shout, used by Trag. in lyr., E. Heracl. 752, El. 1150, Or. 826, 965, etc.: c. acc. cogn., ἰαχεῖν μέλος, αἴλινον, Id. Tr. 515, HF 349; [ἀοιδάν] Ar. Ra. 217; χρησμόν IG 7.4240b2.
rarely c. acc. obj., bewail, νέκυν ὀλόμενον E. Ph. 1295, cf. [1523]:—Pass., κᾷτʼ ἰαχήθης . . ἄδικος thou wert proclaimed . . , Id. Hel. 1147 (prob. for καὶ ἰαχὴ σή . .).
of things, sound, γαῖα σμερδαλέον ἰάχησεν h.Hom. 28.11; τρίποδες ἰαχεῦσι Call. Del. 146, cf. Orph. A. 997, etc.; ὀλολύγματα ἰαχεῖ E. Heracl. 783. [ᾰ in Ep.: ᾱ/ᾰ in Trag. (it is unnecessary to write ἰακχ- when α is long): ᾱ in IG l.c.: ϝῐ, cf. sq. [ἰαχή]]