Where does “妹分” come from?

妹分 (Japanese) comes from Japanese 分, from Middle Chinese ふん, from Middle Chinese 糞.

妹分 (Japanese): sworn younger sister

Definitions

  1. sworn younger sister

Ancestry of “妹分”, step by step

妹分 traces back through two separate lines of ancestry.

via Japanese

StepLanguageWordMeaning
1Japanesea minute; a part, a share, a portion; an obsolete...
2Middle Chineseふん
3Middle Chinese

via Japanese

StepLanguageWordMeaning
1Japanesea close female companion; one's own younger...
2Japanesea person, human; an individual; mankind, people
3Proto-Japonic*pitəone
Every word from Middle Chinese Every word from Middle Chinese ふんEvery word from Japanese