Where does “piikkipensaikko” come from?

piikkipensaikko (Finnish) comes from Finnish piikki, from Swedish spik, from Old Norse spíkr, from Proto-Germanic spīkaz, from Proto-Indo-European spēy- — to stretch; thrive; succeed.

piikkipensaikko (Finnish): thorny thicket

Definitions

thorny thicket

Ancestry of “piikkipensaikko”, step by step

piikkipensaikko traces back through two separate lines of ancestry.

via Finnish piikki

Step	Language	Word	Meaning
1	Finnish	piikki	spike; Short for piikkikenkä; tine, prong
2	Swedish	spik	nail; spike-shaped metal fastener; an fail-safe...
3	Old Norse	spíkr	—
4	Proto-Germanic	spīkaz	—
5	Proto-Indo-European	spēy-	to stretch; thrive; succeed

via Finnish pensaikko

Step	Language	Word	Meaning
1	Finnish	pensaikko	shrubbery; scrub, brush
2	Finnish	pensas	bush; shrub
3	Proto-Finnic	pensas	bush
4	Proto-Finnic	pensa	—

Every word from Proto-Indo-European spēy- →Every word from Proto-Germanic spīkaz →Every word from Old Norse spíkr →