Where does “დერ-” come from?

დერ- (Yiddish) comes from Belarusian да-, from Belarusian да, from Proto-Slavic dȍ, from Proto-Indo-European de — Emphatic or contrastive particle, and, but;...

Ancestry of “დერ-”, step by step

Step	Language	Word	Meaning
1	Belarusian	да-	up to
2	Belarusian	да	before
3	Proto-Slavic	dȍ	up to, until
4	Proto-Indo-European	de	Emphatic or contrastive particle, and, but;...

Every word from Proto-Indo-European de →Every word from Proto-Slavic dȍ →Every word from Belarusian да- →