Where does “купальный” come from?

купальный (Russian) comes from Russian купа́ть, from Old East Slavic купати, from Proto-Slavic kǫpati, from Proto-Indo-European (s)kep- — to grave, to strike; to chop, to dig; to grave,...

купальный (Russian): bathing

Definitions

bathing

Ancestry of “купальный”, step by step

Step	Language	Word	Meaning
1	Russian	купа́ть	to bathe, give a bath
2	Old East Slavic	купати	—
3	Proto-Slavic	kǫpati	to bathe; to swim
4	Proto-Indo-European	(s)kep-	to grave, to strike; to chop, to dig; to grave,...

Every word from Proto-Indo-European (s)kep- →Every word from Proto-Slavic kǫpati →Every word from Old East Slavic купати →