On Twitter today, Neil Gaiman posted this:
The verb kvell was unfamiliar to me. The dictionaries revealed that it is, unsurprisingly, of Yiddish origin, related to the German verb quellen, which can mean several things, among which well up. The OED’s notes it as “US slang” and gives the definition as “[ad. Yiddish kveln, ad. G. quellen to gush, well up.] ” while the dictionary that comes with OS X, which is based on the New Oxford American Dictionary, has “feel happy and proud”. The word is also on Wikipedia’s very useful List of English words of Yiddish origin (“to feel delighted and proud to the point of tears”)
A beautiful word, which I’m sure to keep in mind.