Where does “cavala” come from?

cavala (Piedmontese) comes from Latin caballa, from Latin -a, from Proto-Italic -ā, from Proto-Indo-European -éh₂.

cavala (Piedmontese): mare

Definitions

Step	Language	Word	Meaning
1	Latin	caballa	mare
2	Latin	-a	suffixed to the roots of verbs, forms agent...
3	Proto-Italic	-ā	Forms masculine agent nouns from prefixed or compounded bases
4	Proto-Indo-European	-éh₂	—