νεφελοκοκκυγία
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)
ἡ, (κόκκυξ)
A Cloudcuckoo-town, built by the birds in Ar.Av.819, al., a satire on Athens.