Where does “bletsian,” come from?

bletsian, (Old English) comes from Proto-West Germanic blōdisōn, from Proto-Germanic blōþą, from Proto-Indo-European bʰleh₃-, from Proto-Indo-European bʰel-, from Proto-Indo-European bʰōl-.

Ancestry of “bletsian,”, step by step

Step	Language	Word	Meaning
1	Proto-West Germanic	blōdisōn	to mark with blood
2	Proto-Germanic	blōþą	blood
3	Proto-Indo-European	bʰleh₃-	bloom, flower
4	Proto-Indo-European	bʰel-	to sound; to speak, roar, bark; shiny, white; to...
5	Proto-Indo-European	bʰōl-	—

Every word from Proto-Indo-European bʰōl- →Every word from Proto-Indo-European bʰel- →Every word from Proto-Indo-European bʰleh₃- →