ἰσχυριστέον
From LSJ
πάντων χρηµάτων µέτρον ἐστίν ἄνθρωπος, τῶν µέν ὄντων ὡς ἐστιν, τῶν δέ οὐκ ὄντων ὡς οὐκ ἔστιν → man is the measure of all things, of things which are, that they are, and of things which are not, that they are not (Protagoras fr.1)
English (LSJ)
one must maintain stoutly, Pl.R. 533a.
Greek (Liddell-Scott)
ἰσχῡριστέον: ῥημ. ἐπίθ. τοῦ ἰσχυρίζομαι, δεῖ ἰσχυρίζεσθαι, Πλάτ. Πολ. 533Α.
Greek Monotonic
ἰσχῡριστέον: ρημ. επίθ., αυτό για το οποίο κανείς πρέπει να δείξει επιμονή, σε Πλάτ.
German (Pape)
man muß behaupten, Plat. Rep. VII.533a.