ἐκπονεῖν
From LSJ
διὸ πᾶσαι αἱ τέχναι καὶ αἱ ποιητικαὶ ἐπιστῆμαι δυνάμεις εἰσίν → hence all arts, i.e. the productive sciences, are potencies
Greek > English (Woodhouse Verbs Reversed)
(see also ἐκπονέω): earn, acquire by labour, bring to perfection, bring to success by effort, carry through by effort, digest food, labor out, labour out, make by work, make perfect, win by labor, win by labour, work out, work up
Lexicon Thucydideum
elaborare, excolere, to work diligently at, cultivate, 3.38.2,
PASS. 6.31.3.