ἐπιμελεῖσθαι
From LSJ
Τίς, ξένος ὦ ναυηγέ; Λεόντιχος ἐνθάδε νεκρὸν εὗρέ σ᾿ ἐπ᾿ αἰγιαλοῦ, χῶσε δὲ τῷδε τάφῳ, δακρύσας ἐπίκηρον ἑὸν βίον· οὐδὲ γὰρ αὐτὸς ἥσυχος, αἰθυίῃ δ᾿ ἶσα θαλασσοπορεῖ. → Who art thou, shipwrecked stranger? Leontichus found thee here dead on the beach, and buried thee in this tomb, weeping for his own uncertain life; for he also rests not, but travels over the sea like a gull.
Lexicon Thucydideum
curam habere, operam dare, to take pains, devote effort, 3.25.1, 4.2.3, 4.118.3. 6.41.4, [depravati codd. corrupted manuscripts ἐπιμελήμ.] 6.91.5. 7.8.3, 8.68.1.
idem, the same 6.54.6, 7.39.2, [Vat. et alii Vatican and other manuscripts ἐπιμελουμ.].