Where does “mag-atop” come from?

mag-atop (Bikol Central) comes from Bikol Central atop, from Proto-Philippine qatəp, from Proto-Malayo-Polynesian qatəp — roof.

Ancestry of “mag-atop”, step by step

StepLanguageWordMeaning
1Bikol Centralatoproof; thatch
2Proto-Philippineqatəproof
3Proto-Malayo-Polynesianqatəproof
Every word from Proto-Malayo-Polynesian qatəp →Every word from Proto-Philippine qatəp →Every word from Bikol Central atop →