ὑποσιδηρόω
From LSJ
Ἔοικα γοῦν τούτου γε σμικρῷ τινι αὐτῷ τούτῳ σοφώτερος εἶναι, ὅτι ἃ μὴ οἶδα οὐδὲ οἴομαι εἰδέναι → I seem, then, in just this little thing to be wiser than this man at any rate, that what I do not know I do not think I know either
English (LSJ)
in pf. part. Pass., δακτύλιοι χρυσοῖ ὑποσεσιδηρωμένοι, i.e. iron rings gilded, Inscr.Délos399B14 (ii B. C.).