μεταχειρίζεσθαι
From LSJ
Βέβαιον οὐδέν ἐστιν ἐν θνητῷ βίῳ → Nihil, ut videtur, proprium in vita datur → Nichts Festes gibt's im Leben eines Sterblichen
Greek > English (Woodhouse Verbs Reversed)
(see also μεταχειρίζω): administer, manage, pursue, regulate, carry on, take in hand