Where does “rasvaantua” come from?

rasvaantua (Finnish) comes from Finnish -Vntua, from Finnish -untua, from Finnish -ntua, from Finnish -ua, from Proto-Finnic -üdäk — Forms mainly passive or anticausative verbs.

Ancestry of “rasvaantua”, step by step

StepLanguageWordMeaning
1Finnish-VntuaForms passive verbs
2Finnish-untua—
3Finnish-ntuaForms reflexive or inchoative intransitive verbs
4Finnish-uaForms stative or inchoative intransitive verbs...
5Proto-Finnic-üdäkForms mainly passive or anticausative verbs
Every word from Proto-Finnic -üdäk →Every word from Finnish -ua →Every word from Finnish -Vntua →