Where does “suunpieksäntä” come from?

suunpieksäntä (Finnish) comes from Finnish pieksäntä, from Finnish pieksää, from Proto-Finnic peksädäk, from Proto-Uralic peksä- — to beat.

Ancestry of “suunpieksäntä”, step by step

suunpieksäntä traces back through two separate lines of ancestry.

via Finnish pieksäntä

StepLanguageWordMeaning
1Finnishpieksäntäbeating, thrashing
2FinnishpieksääSynonym of piestä; Third-person singular...
3Proto-Finnicpeksädäkto beat
4Proto-Uralicpeksä-to beat

via Finnish suu

StepLanguageWordMeaning
1Finnishsuumouth
2Proto-Finnicsüüthread, fibre; annual ring; reason, cause
3Proto-Uralicśuwemouth
Every word from Proto-Uralic peksä-Every word from Proto-Finnic peksädäkEvery word from Finnish pieksää