Where does “pabagsak” come from?

pabagsak (Bikol Central) comes from Bikol Central bagsak, from Proto-Philippine *bag(ə)sák.

Ancestry of “pabagsak”, step by step

pabagsak traces back through two separate lines of ancestry.

via Bikol Central bagsak

StepLanguageWordMeaning
1Bikol Centralbagsak—
2Proto-Philippine*bag(ə)sák—

via Bikol Central pa

StepLanguageWordMeaning
1Bikol Centralpa—
Every word from Proto-Philippine *bag(ə)sák →Every word from Bikol Central bagsak →