Where does “tcaga” come from?

tcaga (Guinea-Bissau Creole) comes from Portuguese chaga, from Old Portuguese chaga, from Latin plāga, from Latin plagius, from Ancient Greek πλάγιος, from Ancient Greek -ῐος, from Proto-Indo-European -yós — Creates adjectives from noun or verb stems.

tcaga (Guinea-Bissau Creole): sore

Definitions

sore

Ancestry of “tcaga”, step by step

Step	Language	Word	Meaning
1	Portuguese	chaga	sore
2	Old Portuguese	chaga	sore, wound
3	Latin	plāga	plague, misfortune
4	Latin	plagius	—
5	Ancient Greek	πλάγιος	placed sideways, slanting, aslant
6	Ancient Greek	-ῐος	belonging to; of”, “belonging to”, “pertaining to
7	Proto-Indo-European	-yós	Creates adjectives from noun or verb stems

Every word from Proto-Indo-European -yós →Every word from Ancient Greek -ῐος →Every word from Ancient Greek πλάγιος →