1. of grief of annoyance, usu. twice repeated, “ἰοὺ ἰού” D.19.209; ἰ. ἰ. δύστηνος or δύστηνε, S.Tr.1143, OT1071; ἰ. ἰ. βοᾶν, κεκραγέναι, Ar.Nu.543, Pax345: c. gen., “ἰ. ἰ. τῶν . . κιγκλίδων” Jul. Caes.330d: rarely once, φῦ (φεῦ codd.), “ἰ. τῆς ἀσβόλου” Ar.Th.245; or thrice, Id.Pax110: with other Interj., “ἰ. ἰ. ὢ ὢ κακά” A.Ag.1214; “ἰ. ἰ. πόπαξ” Id.Eu.143 (lyr.).
ἰού or ἰοῦ (v. sub fin.), Interj., a loud cry expressive of sorrow, joy, or surprise,