ἀρκτικός
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), ή, όν, (
A ἄρκτος 1.2) near the Bear, arctic, northern, πόλος Arist.Mu.392a3; κύκλος Hipparch.1.7.6, etc.: pl., Gem.5.10; -κά, τά, the northern constellations, Str.1.1.21: Comp. -ώτερος ib. 12, Gem.14.10: Sup., Str.1.1.6. II connected with the Great Bear, δύναμις PMag.Par.1.1275.
ἀρκτικός (B), ή, όν, (ἄρχομαι)
A initial, placed at the beginning, of a sentence, A.D.Synt.28.19; ἀ. τεθεὶς σύνδεσμος Demetr.Eloc.56; of a word, συλλαβή Heph.1. 2 originative, c. gen., πυρετοῦ Gal. 17(2).299.
ἀρκτικός (C), ή, όν, (ἄρχω)
A imperious, Vett.Val.9.16.
German (Pape)
[Seite 354] anfangend, Apoll. pron. 309, 6. nördlich, Pol. u. Sp.