ἀθρόον
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
Russian (Dvoretsky)
ἀθρόον: I τό сосредоточение войск, главные силы (τῶν πολεμίων Xen.).
II adv.
1) сообща, всей толпой, хором (ἐμβοᾶν Thuc.);
2) сразу, внезапно: ἀ. ἐκκαγχάζειν Arst. внезапно разразиться хохотом.
