Where does “отпи́ть” come from?

отпи́ть (Russian) comes from Russian от-, from Proto-Slavic otъ-.

Ancestry of “отпи́ть”, step by step

Step	Language	Word	Meaning
1	Russian	от-	away from
2	Proto-Slavic	otъ-	—

отпи́ть — Etymology, Origin & Word History | Etymology Explorer