ἐκβεβαιόομαι
From LSJ
ἐβόα καὶ βαρβαρικῶς καὶ Ἑλληνικῶς → shouted out both in Persian and Greek, shouted out in the barbarian tongue and in Greek
English (LSJ)
A confirm, establish, Plu.2.283a; νίκημα Id.Pomp.19, cf. Ages.19.
German (Pape)
[Seite 754] bestätigen, befestigen, τὴν νίκην Plut. Ages. 19 u. öfter, wie a. Sp.