Where does “dumdom” come from?

dumdom (Bikol Central) comes from Proto-Malayo-Polynesian dəmdəm, from Proto-Austronesian nəmnəm — to think.

Ancestry of “dumdom”, step by step

StepLanguageWordMeaning
1Proto-Malayo-Polynesiandəmdəmto think
2Proto-Austronesiannəmnəmto think
Every word from Proto-Austronesian nəmnəm →Every word from Proto-Malayo-Polynesian dəmdəm →