Where does “øppin” come from?

øppin (Old Swedish) comes from Old Norse opinn, from Proto-Germanic upanaz, from Proto-Indo-European upó, from Proto-Indo-European h₃ewp-.

Ancestry of “øppin”, step by step

StepLanguageWordMeaning
1Old Norseopinnopen
2Proto-Germanicupanazopen
3Proto-Indo-Europeanupóunder, below
4Proto-Indo-Europeanh₃ewp-—
Every word from Proto-Indo-European h₃ewp- →Every word from Proto-Indo-European upó →Every word from Proto-Germanic upanaz →