Where does “swisdeti” come from?

swisdeti (Proto-Celtic) comes from Proto-Indo-European sweysd- — to hiss.

Ancestry of “swisdeti”, step by step

StepLanguageWordMeaning
1Proto-Indo-Europeansweysd-to hiss
Every word from Proto-Indo-European sweysd-
swisdeti — Etymology, Origin & Word History | Etymology Explorer