διεξελέγχω
From LSJ
Καὶ τῶν λεγόντων εὖ καλὸν τὸ μανθάνειν → It is a fine thing to learn from those who speak well
English (LSJ)
A refute utterly, Luc.Alex.61, Plu.2.922e, Gal.4.518:—Pass., ὅταν ἀμαθέστεροι διεξελέγχωνται when they are convicted of ignorance, Them. Or.21.259b.