Where does “ropsaus” come from?

ropsaus (Finnish) comes from Finnish ropsahtaa, from Finnish -ähtää, from Proto-Finnic -ahtadak, from Proto-Uralic -ašta-.

Ancestry of “ropsaus”, step by step

StepLanguageWordMeaning
1Finnishropsahtaato patter quickly or briefly
2Finnish-ähtääFront vowel variant of -ahtaa
3Proto-Finnic-ahtadakForms momentane verbs
4Proto-Uralic-ašta-—
Every word from Proto-Uralic -ašta- →Every word from Finnish -ähtää →Every word from Finnish ropsahtaa →