Where does “รอยยิ้ม” come from?

รอยยิ้ม (Thai) comes from Thai รอย, from Proto-Tai rwuːjᴬ — track.

รอยยิ้ม (Thai): a smile

Definitions

  1. a smile

Ancestry of “รอยยิ้ม”, step by step

รอยยิ้ม traces back through two separate lines of ancestry.

via Thai รอย

StepLanguageWordMeaning
1Thaiรอยtrace; mark; track; line
2Proto-Tairwuːjᴬtrack

via Thai ยิ้ม

StepLanguageWordMeaning
1Thaiยิ้มsmile; to smile; to fuck: to have sex
Every word from Proto-Tai rwuːjᴬEvery word from Thai รอย
รอยยิ้ม — Etymology, Origin & Word History | Etymology Explorer