Where does “þrepskjǫldr” come from?

þrepskjǫldr (Old Norse) comes from Proto-Germanic þreskwaþluz, from Proto-Germanic þreskaną, from Proto-Indo-European terh₁- — to rub, turn; to drill, pierce.

Ancestry of “þrepskjǫldr”, step by step

StepLanguageWordMeaning
1Proto-Germanicþreskwaþluzthreshold
2Proto-Germanicþreskanąto thresh
3Proto-Indo-Europeanterh₁-to rub, turn; to drill, pierce
Every word from Proto-Indo-European terh₁- →Every word from Proto-Germanic þreskaną →Every word from Proto-Germanic þreskwaþluz →