Where does “metsittyminen” come from?

metsittyminen (Finnish) comes from Finnish metsittyä, from Finnish metsittää, from Finnish -ttää, from Proto-Finnic -ttadak, from Proto-Uralic -kta-.

Ancestry of “metsittyminen”, step by step

StepLanguageWordMeaning
1FinnishmetsittyäTo become forested
2Finnishmetsittääto forest, afforest; to reforest
3Finnish-ttääFront vowel variant of -ttaa
4Proto-Finnic-ttadakCreates causative verbs from regular verbs,...
5Proto-Uralic-kta-—
Every word from Proto-Uralic -kta- →Every word from Finnish -ttää →Every word from Proto-Finnic -ttadak →