φασκάς
From LSJ
ἐπ' αὐτὸν ἥκεις τὸν βατῆρα τῆς θύρας → you've come to the crux of the matter, come to the point, hit the nail on the head, you've come to the very threshold of the door, you are come to the very threshold of the door, you've arrived at the truth of the matter
English (LSJ)
φασκάδος, ἡ, a kind of duck, Alex.Mynd. ap. Ath.9.395d, cf. βασκάς.
German (Pape)
[Seite 1258] άδος, ἡ, eine Entenart, auch βασκάς und βοσκάς geschrieben, Alex. Mynd. bei Ath. IX, 395 u. Arist. H. A. 8, 3.
Russian (Dvoretsky)
φασκάς: άδος ἡ птица чирок (Arst. - v.l. βοσκάς).
Greek (Liddell-Scott)
φασκάς: -άδος, ἡ, εἶδος νήσσης, «πάππιας», «αἱ λεγόμεναι φασκάδες μικρῷ μείζονες οὖσαι τῶν μικρῶν κολυμβίδων, τὰ λοιπὰ νήτταις εἰσὶ παραπλήσιοι» Ἀλέξ. Μύνδ. παρ’ Ἀθην. 395Ε· φέρεται καὶ βασκάς, Ἀριστ. π. τὰ Ζ. Ἱστ. 8. 3, 15.