αὐτὸν κέκρουκας τὸν βατῆρα τοῦ λόγου → you have struck the very threshold of the argument, you have struck the most important and chiefmost point
-ον, Αο ψηλά κτισμένος.[ΕΤΥΜΟΛ. < ὕφι «ψηλά» + -δομος (< δόμος < δέμω), πρβλ. ἀρτίδομος].