βαλλήν
From LSJ
πολλὰ μεταξὺ πέλει κύλικος καὶ χείλεος ἄκρου → there is many a slip twixt cup and lip, there's many a slip twixt cup and lip, there's many a slip 'twixt cup and lip, there's many a slip twixt the cup and the lip, there's many a slip 'twixt the cup and the lip
English (LSJ)
ὁ (not βαλήν Hdn.Gr.2.923),
A king, A.Pers.657, S.Fr.515. —Prob. Phrygian word acc. to Hsch., but Thurian acc. to Hermesianax Hist. ap. Ps.-Plu.Fluv.12.4: βαλληναῖον ὄρος, = βασιλικόν (in Phrygia) and βαλλήν, a fabulous precious stone, Ps.-Plu.Fluv.12.3,4.