κρύβηλος
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)
κρύβηλον, hidden, Hsch.:—also κρυβ-ήτης, ου, ὁ, one hidden in the earth, and κρυβ-ήσια, τά, = νεκύσια, Id.
Greek Monolingual
κρύβηλος, -ον (Α)
(κατά τον Ησύχ.) κρυμμένος, κρυπτός.
[ΕΤΥΜΟΛ. < θ. κρυβ-, άλλη μορφή του θ. κρυπτ- του κρύπτω, αναλογική προς το επίρρ. κρύβδην, + κατάλ. -ηλος (πρβλ. κίβδηλος, κορύμβηλος)].