κατ' ἰσχύν

From LSJ

οὐκ ἐπιθυμήσεις τὴν γυναῖκα τοῦ πλησίον σου → thou shalt not covet thy neighbor's wife, thou shalt not covet thy neighbour's wife, you shall not covet your neighbor's wife, you shall not covet your neighbour's wife

Source

Greek > English (Woodhouse)

by force, by violence