προεργάζομαι
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)
Med. with pf. Pass.,
A work beforehand, τῷ βαρβάρῳ Hdt.2.158; work or till beforehand, τῷ σπόρῳ νεόν X.Oec.20.3:—pf. also in pass. sense, to be done before, τὰ προειργασμένα Antipho 2.2.12, Th.2.89, 8.65; ἡ προειργασμένη δόξα glory won before, X.An.6.1.21; τὸ ὀψώνιον . . τοῦ -ειργασμένου χρόνου OGI266.8 (Pergam., iii B.C.).