Where does “вычеркать” come from?

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

Ancestry of “вычеркать”, step by step

StepLanguageWordMeaning
1Russianвы́-out, out from describing an action of moving outside from inside
2Old East Slavicвꙑ-—
3Proto-Slavicvy-out
4Proto-Balto-Slavicū́—
5Proto-Indo-Europeanúdout, outward
Every word from Proto-Indo-European úd →Every word from Russian вы́- →Every word from Proto-Balto-Slavic ū́ →