ἐμφρουρεῖν
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
Greek > English (Woodhouse Verbs Reversed)
(see also: ἐμφρουρῶ, ἐμφρουρέω) be on guard
Lexicon Thucydideum
custodias agere in loco, to keep watch at a place, 4.110.1, 8.60.1.
