Blame the Bible.
And their literary history.
The process results from, in equal measure, Jewish separateness and Jewish assimilation.
A look at the phenomenon by which Yiddish words become English words under the influence of other, similar-sounding English words.
When people find out that I teach Hebrew literature, they invariably remark, “Oh, you must be fluent.” I’ve now been working hard at it for many decades, and I’m still not there.
Where does the Yiddish word narishkayt come from?