From <span class="searchmatch">Proto</span>-Uralic *kupsa-. Cognates include <span class="searchmatch">Proto</span>-Finnic *kustudak and <span class="searchmatch">Proto</span>-Samic *kopsētēk. *<span class="searchmatch">kusni</span> (stem *kus-) (intransitive) to go out (of fire) Komi:...
(fire) <span class="searchmatch">Proto</span>-Samoyedic: *kəptå- (see there for further descendants) Ugric: Khanty: Eastern Khanty: [script needed] (kăwla-) <span class="searchmatch">Proto</span>-<span class="searchmatch">Permic</span>: *<span class="searchmatch">kusni</span> (see there...