ἐνακούω
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)
A hear, LXX Na.1.12 (Pass.); obey, 1 Es.4.10, Vett.Val 42.7 (Pass.), POxy.120.4(iv A.D.); listen to, c. gen.rei, S.El.81. II take in sounds, be sensitive to, ἰαχῆς Hp.Cord.8, cf.Liqu.2: metaph., ἐ. τῆς ξυμφορῆς to be affected by it, Id.Art.53; ἐνακούει ἐμβαλλόμενα, of dislocations, they obey the surgeon's hand, i.e. are set, Id.Fract.40; ἐ. ἰητρείης yield to treatment, Id.Art.62.
German (Pape)
[Seite 826] (s. ἀκούω), 1) darin-, anhören, τινός, Soph. El. 80 u. Sp. – 2) gehorchen, nachgeben, Hippocr.