Where does “回外” come from?

回外 (Japanese) comes from Japanese 外, from Middle Chinese 外.

回外 (Japanese): supination

Definitions

  1. supination

Ancestry of “回外”, step by step

回外 traces back through two separate lines of ancestry.

via Japanese 外

StepLanguageWordMeaning
1Japanese外(the) outside
2Middle Chinese外—

via Japanese 回

StepLanguageWordMeaning
1Japanese回time, occasion; turn, round; inning
2Middle Chinese回—
Every word from Middle Chinese 外 →Every word from Japanese 外 →
回外 — Etymology, Origin & Word History | Etymology Explorer