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.
Of persons or things: P. and V. ἀρετή, ἡ. The excellence of the soil: P. ἀρετὴ γῆς (Thuc. 1, 2).
