τυραννεύειν
From LSJ
τὸ γὰρ μυστήριον ἤδη ἐνεργεῖται τῆς ἀνομίας· μόνον ὁ κατέχων ἄρτι ἕως ἐκ μέσου γένηται. (2Thess 2:7) → For the mystery of lawlessness is already at work — just at work until the one who is now constraining it is taken out.
Greek > English (Woodhouse Verbs Reversed)
(see also τυραννεύω): be a despot, domineer, govern as king or commander, lay down the law, rule over as king