Where does “εψές” come from?

εψές (Greek) comes from Byzantine Greek ὀψές, from Ancient Greek ὀψέ, from Proto-Indo-European h₁epi, from Proto-Indo-European h₁eps.

εψές (Greek): last night, yesterday evening; Alternative form...

Definitions

Step	Language	Word	Meaning
1	Byzantine Greek	ὀψές	—
2	Ancient Greek	ὀψέ	late; long after; late in the day, in the evening
3	Proto-Indo-European	h₁epi	on, at, near
4	Proto-Indo-European	h₁eps	—