Where does “palleaisku” come from?

palleaisku (Finnish) comes from Finnish isku, from Finnish -u, from Proto-Finnic -u — Forms nouns from adjectives, nouns.

palleaisku (Finnish): hit in the diaphragm, getting the wind knocked out of one

Definitions

palleaisku traces back through two separate lines of ancestry.

Step	Language	Word	Meaning
1	Finnish	isku	hit, blow; impact; attentat, attack, strike, raid
2	Finnish	-u	Forms nouns from verbs. Most common with "e"- and...
3	Proto-Finnic	-u	Forms nouns from adjectives, nouns

Step	Language	Word	Meaning
1	Finnish	pallea	The thoracic diaphragm
2	Finnish	palle	A hem; A doubled-back rim of anything, especially...