Where does “smärttröskel” come from?

smärttröskel (Swedish) comes from Swedish tröskel, from Old Swedish þriskulde, from Old Norse þreskǫldr, from Proto-Germanic þreskwaþluz, from Proto-Germanic þreskaną, from Proto-Indo-European terh₁- — to rub, turn; to drill, pierce.

Ancestry of “smärttröskel”, step by step

smärttröskel traces back through two separate lines of ancestry.

via Swedish tröskel

StepLanguageWordMeaning
1Swedishtröskela threshold, a door sill, a barrier
2Old Swedishþriskulde—
3Old Norseþreskǫldr—
4Proto-Germanicþreskwaþluzthreshold
5Proto-Germanicþreskanąto thresh
6Proto-Indo-Europeanterh₁-to rub, turn; to drill, pierce

via Swedish smärta

StepLanguageWordMeaning
1Swedishsmärtaa pain, an ache, a suffering; to hurt, to pain
2Middle Low Germansmerte—
Every word from Proto-Indo-European terh₁- →Every word from Proto-Germanic þreskaną →Every word from Proto-Germanic þreskwaþluz →