Where does “שוועסטער” come from?

שוועסטער (Yiddish) comes from Middle High German swëster, from Old High German swester, from Proto-West Germanic *swester.

שוועסטער (Yiddish): sister

Definitions

Step	Language	Word	Meaning
1	Middle High German	swëster	—
2	Old High German	swester	sister
3	Proto-West Germanic	*swester	—

שוועסטער — Etymology, Origin & Word History | Etymology Explorer