Where does “øfstr” come from?

øfstr (Old Norse) comes from Proto-Germanic ubistaz, from Proto-Germanic ub, from Proto-Indo-European upó, from Proto-Indo-European h₃ewp-.

Ancestry of “øfstr”, step by step

StepLanguageWordMeaning
1Proto-Germanicubistaz—
2Proto-Germanicubunder
3Proto-Indo-Europeanupóunder, below
4Proto-Indo-Europeanh₃ewp-—

Words derived from “øfstr”

Every word from Proto-Indo-European h₃ewp- →Every word from Proto-Indo-European upó →Every word from Proto-Germanic ub →