Where does “旅鼠” come from?

旅鼠 (Japanese) comes from Japanese 鼠, from Japanese nezumi.

Ancestry of “旅鼠”, step by step

旅鼠 traces back through two separate lines of ancestry.

via Japanese

StepLanguageWordMeaning
1Japanesea mouse or a rat; general term for members of...
2Japanesenezumi

via Japanese

StepLanguageWordMeaning
1Japanesein ancient China, a military unit of 500...
2Middle Chinese
Every word from Japanese nezumiEvery word from Japanese