Where does “запечатывать” come from?

запечатывать (Russian) comes from Russian запеча́тать, from Russian за́-, from Proto-Slavic za- — for.

запечатывать (Russian): to seal up

Definitions

Step	Language	Word	Meaning
1	Russian	запеча́тать	—
2	Russian	за́-	—
3	Proto-Slavic	za-	for

запечатывать — Etymology, Origin & Word History | Etymology Explorer