Where does “kajaus” come from?

kajaus (Finnish) comes from Finnish kajahtaa, from Finnish kaikua, from Finnish -ua, from Proto-Finnic -üdäk — Forms mainly passive or anticausative verbs.

kajaus (Finnish): a reverberating blow or hit

Definitions

  1. a reverberating blow or hit

Ancestry of “kajaus”, step by step

kajaus traces back through two separate lines of ancestry.

via Finnish kajahtaa

StepLanguageWordMeaning
1Finnishkajahtaato echo, ring out, sound
2Finnishkaikuato echo, reverberate; Partitive singular form...
3Finnish-uaForms stative or inchoative intransitive verbs...
4Proto-Finnic-üdäkForms mainly passive or anticausative verbs

via Finnish us

StepLanguageWordMeaning
1Finnishus-ing
Every word from Proto-Finnic -üdäkEvery word from Finnish -uaEvery word from Finnish kaikua