Where does “私書箱” come from?
私書箱 (Japanese) comes from Japanese 箱 — box.
Ancestry of “私書箱”, step by step
私書箱 traces back through two separate lines of ancestry.
via Japanese 箱
| Step | Language | Word | Meaning |
|---|---|---|---|
| 1 | Japanese | 箱 | box |
via Japanese 私書
| Step | Language | Word | Meaning |
|---|---|---|---|
| 1 | Japanese | 私書 | private document |