αὐτὸν κέκρουκας τὸν βατῆρα τοῦ λόγου → you have struck the very threshold of the argument, you have struck the most important and chiefmost point
synīzēsis: is, f., = συνίζησις,>
I a contraction of two vowels into one syllable, Serv. Verg. A. 1, 698.