Where does “skælve” come from?

skælve (Danish) comes from Old Danish skialuæ, from Old Norse skjálfa, from Proto-Germanic skelbaną — to shiver, tremble.

skælve (Danish): to tremble, to quake

Definitions

Step	Language	Word	Meaning
1	Old Danish	skialuæ	—
2	Old Norse	skjálfa	—
3	Proto-Germanic	skelbaną	to shiver, tremble

skælve — Etymology, Origin & Word History | Etymology Explorer