Where does “密室殺人” come from?

密室殺人 (Japanese) comes from Japanese 殺人, from Japanese 人, from Proto-Japonic *pitə — one.

密室殺人 (Japanese): a locked-room murder

Definitions

  1. a locked-room murder

Ancestry of “密室殺人”, step by step

密室殺人 traces back through two separate lines of ancestry.

via Japanese 殺人

StepLanguageWordMeaning
1Japanese殺人murder of a person; homicide
2Japanesea person, human; an individual; mankind, people
3Proto-Japonic*pitəone

via Japanese 密室

StepLanguageWordMeaning
1Japanese密室hidden room; secret chamber
Every word from Proto-Japonic *pitəEvery word from Japanese Every word from Japanese 殺人
密室殺人 — Etymology, Origin & Word History | Etymology Explorer