шило

From LSJ

αὐτὸν κέκρουκας τὸν βατῆρα τοῦ λόγου → you have struck the very threshold of the argument, you have struck the most important and chiefmost point

Source

Russian > Greek

κεντητήριον, ὕπεας, ὕπεαρ, ἄκεστρα