Where does “非常口” come from?

非常口 (Japanese) comes from Japanese 口, from Japanese くち, from Japanese 朽ちる.

非常口 (Japanese): emergency exit

Definitions

  1. emergency exit

Ancestry of “非常口”, step by step

非常口 traces back through two separate lines of ancestry.

via Japanese 口

StepLanguageWordMeaning
1Japanese口mouth; opening; the mouth
2Japaneseくちmouth
3Japanese朽ちる—

via Japanese 非常

StepLanguageWordMeaning
1Japanese非常emergency
Every word from Japanese 朽ちる →Every word from Japanese くち →Every word from Japanese 口 →