Where does “snygga upp” come from?

snygga upp (Swedish) comes from Swedish upp, from Swedish löpa, from Old Swedish løpa, from Old Norse hlaupa, from Proto-Germanic hlaupaną, from Proto-Indo-European klaup-.

Ancestry of “snygga upp”, step by step

snygga upp traces back through two separate lines of ancestry.

via Swedish upp

Step	Language	Word	Meaning
1	Swedish	upp	up
2	Swedish	löpa	to run along, stretch; to run, to move quickly...
3	Old Swedish	løpa	to run
4	Old Norse	hlaupa	to leap, jump, spring
5	Proto-Germanic	hlaupaną	to jump forward, to leap
6	Proto-Indo-European	klaup-	—

via Swedish snygg

Step	Language	Word	Meaning
1	Swedish	snygg	handsome, good-looking; clean; cool
2	Old Norse	snøggr	swift; fast; quick; rapid
3	Proto-Norse	snaggwu-	—

Every word from Proto-Indo-European klaup- →Every word from Proto-Germanic hlaupaną →Every word from Old Norse hlaupa →