Where does “nai lưng” come from?

nai lưng (Vietnamese) comes from Vietnamese lưng, from Proto-Vietic k-ləŋ, from Proto-Mon-Khmer t₁lan — python.

nai lưng (Vietnamese): to subject oneself to hard labour; to toil

Definitions

  1. to subject oneself to hard labour; to toil

Ancestry of “nai lưng”, step by step

nai lưng traces back through two separate lines of ancestry.

via Vietnamese lưng

StepLanguageWordMeaning
1Vietnameselưngback
2Proto-Vietick-ləŋback
3Proto-Mon-Khmert₁lanpython

via Vietnamese nai

StepLanguageWordMeaning
1Vietnamesenaia sambar deer; any species of deer; innocent;...
2Proto-Vietick-ɗeːsambar deer
Every word from Proto-Mon-Khmer t₁lan →Every word from Proto-Vietic k-ləŋ →Every word from Vietnamese lưng →