Where does “*rodrom” come from?

*rodrom (Proto-Oceanic) comes from Proto-Malayo-Polynesian dəmdəm, from Proto-Austronesian nəmnəm — to think.

Ancestry of “*rodrom”, step by step

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