βύσμα
From LSJ
Πολλῶν ὁ καιρὸς γίγνεται διδάσκαλος → Rebus magistra plurimis occasio → Zum Lehrer wird für viele die Gelegenheit
English (LSJ)
ατος, τό, (βύω)
A plug, bung, Hp.Mul.2.114 (pl.), Ar.Fr. 299; Στίλπωνος βύσματα Stilpo's stoppers, i. e. arguments with which he stopped his opponents' mouths, Diph.23.