Where does “kostutella” come from?

kostutella (Finnish) comes from Finnish kostuttaa, from Finnish -ttää, from Proto-Finnic -ttadak, from Proto-Uralic -kta-.

Ancestry of “kostutella”, step by step

StepLanguageWordMeaning
1Finnishkostuttaato moisten; to wet
2Finnish-ttääFront vowel variant of -ttaa
3Proto-Finnic-ttadakCreates causative verbs from regular verbs,...
4Proto-Uralic-kta-—
Every word from Proto-Uralic -kta- →Every word from Finnish -ttää →Every word from Proto-Finnic -ttadak →