Where does “kostonkierre” come from?

kostonkierre (Finnish) comes from Finnish kierre, from Finnish kiertää, from Proto-Finnic keertädäk, from Proto-Finnic keerä, from Proto-Uralic kerä.

Ancestry of “kostonkierre”, step by step

kostonkierre traces back through two separate lines of ancestry.

via Finnish kierre

StepLanguageWordMeaning
1Finnishkierrethread; worm; helix; whirl, spiral
2Finnishkiertääto turn, twist, screw, rotate; to roll; to wind,...
3Proto-Finnickeertädäkto turn; to spin thread
4Proto-Finnickeerätwisted
5Proto-Uralickerä

via Finnish kosto

StepLanguageWordMeaning
1Finnishkostorevenge, vengeance
2Finnishkostaato avenge, revenge, take revenge, get back at (on); to retaliate (to)
3Proto-Finnickostadak? to turn, to turn back
Every word from Proto-Uralic keräEvery word from Proto-Finnic keeräEvery word from Proto-Finnic keertädäk