Where does “надолу” come from?

надолу (Bulgarian) comes from Bulgarian на, from Bulgarian истина, from Old Church Slavonic истина, from Proto-Slavic *jьstina, from Proto-Slavic jistъ — true, genuine; same.

надолу (Bulgarian): down, downwards

Definitions

  1. down, downwards

Ancestry of “надолу”, step by step

надолу traces back through two separate lines of ancestry.

via Bulgarian на

StepLanguageWordMeaning
1Bulgarianнаof, 's; to; of
2Bulgarianистинаtruth
3Old Church Slavonicистинаtruth
4Proto-Slavic*jьstinatruth
5Proto-Slavicjistъtrue, genuine; same

via Bulgarian долу

StepLanguageWordMeaning
1Bulgarianдолуdown, downward; below
2Proto-Slavicdolъvalley; depression, pit
3Proto-Indo-Europeandʰal-—
Every word from Proto-Slavic jistъ →Every word from Proto-Slavic *jьstina →Every word from Old Church Slavonic истина →