Where does “vastakirja” come from?

vastakirja (Finnish) comes 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.

vastakirja (Finnish): bankbook, passbook

Definitions

bankbook, passbook

Ancestry of “vastakirja”, step by step

Step	Language	Word	Meaning
1	Finnish	vasta-	Expressing opposition or contrast: counter-,...
2	Finnish	vasta	Expressing delay or that something takes place...
3	Swedish	kvast	broom; tassel; cyme
4	Old Swedish	quaster	—
5	Old Norse	kvǫstr	—
6	Proto-Germanic	kwastuz	tuft; tassel
7	Proto-Indo-European	gʷes-	twig; leafwork

Every word from Proto-Indo-European gʷes- →Every word from Finnish vasta- →Every word from Proto-Germanic kwastuz →