ἀλλὰ σὺ μὲν νῦν στῆθι καὶ ἄμπνυε → but you, stop now and catch your breath | but do thou now stand, and get thy breath
P. and V. πείθειν, ἀναπείθειν (Eur., Helen 825), V. ἔκπείθειν.
be convinced, be sure: see under sure.