Where does “впрок” come from?

впрок (Russian) comes from Russian в, from Old East Slavic въ, from Proto-Slavic vъ(n), from Proto-Indo-European h₁n̥, from Proto-Indo-European h₁én — in.

впрок (Russian): for future use, in reserve, in store; to one's...

Definitions

  1. for future use, in reserve, in store; to one's...

Ancestry of “впрок”, step by step

впрок traces back through two separate lines of ancestry.

via Russian в

StepLanguageWordMeaning
1Russianвin, at, on; to, into; at, in, on
2Old East Slavicвъinside
3Proto-Slavicvъ(n)in, inside, within; in, into, inside; at
4Proto-Indo-Europeanh₁n̥—
5Proto-Indo-Europeanh₁énin

via Russian прок

StepLanguageWordMeaning
1Russianпрокuse, benefit
2Old East Slavicпрокъrest, remnant
3Proto-Slavicprokъrest, remnant; remainder; remaining
Every word from Proto-Indo-European h₁én →Every word from Proto-Indo-European h₁n̥ →Every word from Proto-Slavic vъ(n) →