rost i kalsongen (Swedish) comes from Swedish i, from Swedish hop, from Old Norse hópr, from Middle Low German hōp, from Old Saxon hōp, from Proto-West Germanic haup, from Proto-Germanic haupaz, from Proto-Indo-European koupos — hill.
Ancestry of “rost i kalsongen”, step by step
rost i kalsongen traces back through 3 separate lines of ancestry.