ἐπιτηδεύω

1. to pursue or practise a thing, make a practice of, make it one's business , Lat. studere rei, with accusative, (Herdotus Historicus), attic:—;also, ἐπ. τι πρός τι to invent for a purpose, (Herdotus Historicus); Pass. to be done with pains and practice, to be made so and so by art , (Herdotus Historicus); of dogs, to be trained , (Xenophon Historicus)
2. with infinitive to take care to do, use to do, (Herdotus Historicus)
(ML)