μολβίς
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)
ίδος, ἡ,
A weight of seven minae, Hsch. μόλγης, ητος, ὁ, = μοχθηρός, Crates Gramm. ap. Sch.Ar.Eq.959; cf. μολγός 11.