Where does “beckmörk” come from?

beckmörk (Swedish) comes from Swedish beck, from Old Norse bik, from Middle Low German pik, from Old Saxon pik, from Proto-West Germanic *pik, from Latin pix, from Proto-Indo-European pik-, from Proto-Indo-European pi- — sap, juice.

beckmörk (Swedish): pitch-dark

Definitions

pitch-dark

Ancestry of “beckmörk”, step by step

beckmörk traces back through two separate lines of ancestry.

via Swedish beck

Step	Language	Word	Meaning
1	Swedish	beck	pitch; A dark, extremely viscous material...
2	Old Norse	bik	—
3	Middle Low German	pik	—
4	Old Saxon	pik	—
5	Proto-West Germanic	*pik	—
6	Latin	pix	pitch, tar
7	Proto-Indo-European	pik-	to be angry; pitch; resin
8	Proto-Indo-European	pi-	sap, juice

via Swedish mörk

Step	Language	Word	Meaning
1	Swedish	mörk	dark
2	Old Swedish	myrker	dark; hidden, obscured; sneaky, insidious
3	Old Norse	myrkr	dark, murky
4	Proto-Germanic	merkuz	dark
5	Proto-Indo-European	mergʷ-	dark, coloured; to flicker; to darken; to be dark

Every word from Proto-Indo-European pi- →Every word from Proto-Indo-European pik- →Every word from Latin pix →