Where does “äkkipysäys” come from?

äkkipysäys (Finnish) comes from Finnish pysäys, from Finnish pysähtää, from Finnish -ähtää, from Proto-Finnic -ahtadak, from Proto-Uralic -ašta-.

Ancestry of “äkkipysäys”, step by step

StepLanguageWordMeaning
1Finnishpysäys—
2Finnishpysähtääto stop by, to stop briefly; to stop
3Finnish-ähtääFront vowel variant of -ahtaa
4Proto-Finnic-ahtadakForms momentane verbs
5Proto-Uralic-ašta-—
Every word from Proto-Uralic -ašta- →Every word from Finnish -ähtää →Every word from Finnish pysähtää →