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
Source
Latin > English
fossatum fossati N N :: ditch, fosse
Latin > English (Lewis & Short)
fossātum: i, n., and fossātus, i, m., v. fosso.
Latin > French (Gaffiot 2016)
fossātum, ī, n. et -us, ī, m., (fosso), fossé : Pall. 10, 13, 2 ; Grom.
Latin > German (Georges)
fossātum, -ātus, s. fossono. I.