Where does “risaus” come from?

risaus (Finnish) comes from Finnish risahtaa, from Finnish -ahtaa, from Proto-Finnic -ahtadak, from Proto-Uralic -ašta-.

Ancestry of “risaus”, step by step

StepLanguageWordMeaning
1Finnishrisahtaato crackle or snap once
2Finnish-ahtaaForms momentane or semelfactive verbs
3Proto-Finnic-ahtadakForms momentane verbs
4Proto-Uralic-ašta-—
Every word from Proto-Uralic -ašta- →Every word from Finnish -ahtaa →Every word from Finnish risahtaa →