Where does “būlla” come from?

būlla (Old High German) comes from Proto-Germanic būlǭ, from Proto-Indo-European bew- — "low-pitch humming noise".

Ancestry of “būlla”, step by step

StepLanguageWordMeaning
1Proto-Germanicbūlǭswelling; bump; boil
2Proto-Indo-Europeanbew-"low-pitch humming noise"
Every word from Proto-Indo-European bew- →Every word from Proto-Germanic būlǭ →