köken: Etymology tree Proto-Indo-European *né Proto-Balto-Slavic *ne Proto-Slavic *ne Old Polish nie Old Polish nie- Proto-Indo-European *delh₁gʰ- Proto-Indo-European *dl̥h₁gʰós Proto-Balto-Slavic *dílˀgas Proto-Slavic *dь̀lgъ Old Polish długi Old Polish niedługi Polish niedługi Proto-Slavic *-o Old Polish -o Polish -o Polish niedługo From niedługi + -o.
one day, someday, some day (at an unspecified time in the future) · one of these days (at an unspecified time in the future, especially in warning of a negative consequence)
köken: Essive singular form of jokin päivä (“some day”).