Where does “mặc dầu” come from?

mặc dầu (Vietnamese) comes from Vietnamese dầu, from Middle Chinese 油.

Ancestry of “mặc dầu”, step by step

mặc dầu traces back through two separate lines of ancestry.

via Vietnamese dầu

StepLanguageWordMeaning
1Vietnamesedầuoil; "Dipterocarpus"
2Middle Chinese油—

via Vietnamese mặc

StepLanguageWordMeaning
1Vietnamesemặcto wear, to put on; to leave alone, to not care
2Proto-Vieticmak—
Every word from Middle Chinese 油 →Every word from Vietnamese dầu →