ἰσήμερος

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

Click links below for lookup in third sources:

Full diacritics: ἰσήμερος	Medium diacritics: ἰσήμερος	Low diacritics: ισήμερος	Capitals: ΙΣΗΜΕΡΟΣ
Transliteration A: isḗmeros	Transliteration B: isēmeros	Transliteration C: isimeros	Beta Code: i)sh/meros

English (LSJ)

ον,= A aequidialis, ib. ἰσήμορτεν· ἀπέθανεν, Hsch.

[Seite 1263] gleich an Tagen, gleich lange dauernd. – Bei Theophr. zur Zeit der Tag- u. Nachtgleiche (?).

ἰσήμερος, -ον (Α)
αυτός που διαρκεί ίσο χρόνο, αυτός που έχει τις ίδιες ημέρες.
[ΕΤΥΜΟΛ. < ἰσ(ο)- + -ήμερος (< ἡμερα), πρβλ. εφήμερος, καλήμερος].