Where does “mag-isog” come from?

mag-isog (Bikol Central) comes from Bikol Central isog, from Proto-Malayo-Polynesian *isuʀ.

Ancestry of “mag-isog”, step by step

StepLanguageWordMeaning
1Bikol Centralisog—
2Proto-Malayo-Polynesian*isuʀ—
Every word from Proto-Malayo-Polynesian *isuʀ →Every word from Bikol Central isog →
mag-isog — Etymology, Origin & Word History | Etymology Explorer