αὐτὸν κέκρουκας τὸν βατῆρα τοῦ λόγου → you have struck the very threshold of the argument, you have struck the most important and chiefmost point
subs.
see attendant, guard. adj. Done under authority: P. and V. κύριος. Public: Ar. and P. δημόσιος.
official officialis N M :: official/servant attending a magistrate; an official