ὑπερινάω
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
English (LSJ)
A purge violently, Hp. as cited by Erot. (cf. ὑπέρινος), Poll.4.179 (Pass.).
Greek (Liddell-Scott)
ὑπερῐνάω: κενόω ἰσχυρῶς διὰ καθάρσεως, Ἱππ., ὡς μνημονεύεται παρὰ τῷ Ἐρωτιαν. (πρβλ. ὑπέρινος), Πολυδ. Δ΄, 179.