Where does “mỏi mệt” come from?

mỏi mệt (Vietnamese) comes from Vietnamese mới, from Chinese 每, from Proto-Mon-Khmer muuj — one.

Ancestry of “mỏi mệt”, step by step

mỏi mệt traces back through two separate lines of ancestry.

via Vietnamese mới

StepLanguageWordMeaning
1Vietnamesemớinew (recently made or created)
2Chinese每—
3Proto-Mon-Khmermuujone

via Vietnamese mệt

StepLanguageWordMeaning
1Vietnamesemệttired, fatigued, weary
Every word from Proto-Mon-Khmer muuj →Every word from Chinese 每 →Every word from Vietnamese mới →