Where does “vurm” come from?

vurm (Swedish) comes from German wurm, from Middle High German wurm, from Old High German wurm, from Proto-West Germanic wurmi, from Proto-Germanic wurmiz, from Proto-Indo-European wr̥mis, from Proto-Indo-European wer- — to burn; to cover, heed, notice; squirrel.

vurm (Swedish): passion, craze, mania, enthusiasm (warm enthusiasm for something)