Where does “выплескаться” come from?

выплескаться (Russian) comes from Russian вы́плескать, from Russian вы́-, from Old East Slavic вꙑ-, from Proto-Slavic vy-, from Proto-Balto-Slavic ū́, from Proto-Indo-European úd — out, outward.

выплескаться (Russian): to splash out, to spill out

Definitions

to splash out, to spill out

Ancestry of “выплескаться”, step by step

Step	Language	Word	Meaning
1	Russian	вы́плескать	to splash out, to spill out
2	Russian	вы́-	out, out from describing an action of moving outside from inside
3	Old East Slavic	вꙑ-	—
4	Proto-Slavic	vy-	out
5	Proto-Balto-Slavic	ū́	—
6	Proto-Indo-European	úd	out, outward

Every word from Proto-Indo-European úd →Every word from Russian вы́- →Every word from Proto-Balto-Slavic ū́ →