Where does “dreg-” come from?

dreg- (Proto-Balto-Slavic) comes from Proto-Indo-European der- — to split, to separate; to tear, to crack, to...

Ancestry of “dreg-”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	der-	to split, to separate; to tear, to crack, to...

dreg- — Etymology, Origin & Word History | Etymology Explorer