Where does “sai trái” come from?

sai trái (Vietnamese) comes from Vietnamese trái, from Proto-Vietic p-laːs, from Proto-Mon-Khmer laas — to spread; to extend.

sai trái (Vietnamese): wrong; erroneous; incorrect; inappropriate

Definitions

  1. wrong; erroneous; incorrect; inappropriate

Ancestry of “sai trái”, step by step

sai trái traces back through two separate lines of ancestry.

via Vietnamese trái

StepLanguageWordMeaning
1Vietnamesetráileft; reverse; morally wrong, unreasonable,...
2Proto-Vieticp-laːsfathom
3Proto-Mon-Khmerlaasto spread; to extend

via Vietnamese sái

StepLanguageWordMeaning
1Vietnamesesáiominous, inauspicious
2Chinese柴—
Every word from Proto-Mon-Khmer laas →Every word from Proto-Vietic p-laːs →Every word from Vietnamese trái →