Where does “在りし日” come from?

在りし日 (Japanese) comes from Japanese 日, from Old Japanese 日, from Proto-Japonic *pi — day, sun.

在りし日 (Japanese): yore; the days of yore; a long time ago

Definitions

  1. yore; the days of yore; a long time ago

Ancestry of “在りし日”, step by step

StepLanguageWordMeaning
1Japanese日Sunday
2Old Japanese日the sun; sunlight, sunshine; daytime, daylight
3Proto-Japonic*piday, sun
Every word from Proto-Japonic *pi →Every word from Old Japanese 日 →Every word from Japanese 日 →