Where does “бог весть какой” come from?

бог весть какой (Russian) comes from Russian весть, from Proto-Slavic věstь, from Proto-Balto-Slavic *waid-, from Proto-Indo-European weyd- — to see.

бог весть какой (Russian): any kind of; God knows what kind of; Lord knows what kind of; some kind of

Definitions

  1. any kind of; God knows what kind of; Lord knows what kind of; some kind of

Ancestry of “бог весть какой”, step by step

бог весть какой traces back through 3 separate lines of ancestry.

via Russian весть

StepLanguageWordMeaning
1Russianвестьnews, piece of news, message; tidings; news;...
2Proto-Slavicvěstьmessage
3Proto-Balto-Slavic*waid-—
4Proto-Indo-Europeanweyd-to see

via Russian како́й

StepLanguageWordMeaning
1Russianкако́йwhat, which
2Old East Slavicкакъwhat, which
3Proto-Slavickakъof what/which kind
4Proto-Balto-Slavic*kōkos—

via Russian Бог

StepLanguageWordMeaning
1RussianБогGod
2Old East Slavicбогъgod
3Proto-Slavicbȍgъshare, cut, wealth, luck
Every word from Proto-Indo-European weyd- →Every word from Proto-Balto-Slavic *waid- →Every word from Proto-Slavic věstь →