Where does “sivuvastainen” come from?

sivuvastainen (Finnish) comes from Finnish vastainen, from Finnish vasta-, from Finnish vasta, from Swedish kvast, from Old Swedish quaster, from Old Norse kvǫstr, from Proto-Germanic kwastuz, from Proto-Indo-European gʷes- — twig; leafwork.

Ancestry of “sivuvastainen”, step by step

sivuvastainen traces back through two separate lines of ancestry.

via Finnish vastainen

StepLanguageWordMeaning
1Finnishvastainenfoul, head-, contrary; anti-, in-, un-; occurring...
2Finnishvasta-Expressing opposition or contrast: counter-,...
3FinnishvastaExpressing delay or that something takes place...
4Swedishkvastbroom; tassel; cyme
5Old Swedishquaster
6Old Norsekvǫstr
7Proto-Germanickwastuztuft; tassel
8Proto-Indo-Europeangʷes-twig; leafwork

via Finnish sivu

StepLanguageWordMeaning
1Finnishsivupage, side; side; flank
Every word from Proto-Indo-European gʷes-Every word from Finnish vasta-Every word from Proto-Germanic kwastuz