肥後守

Etymology
Compound of. Coined as part of the system of the late 600s and early 700s.

The sense arose from this term being used as a trademark for a specific brand of pocketknife, originally produced by former swordmakers in. This brand name then became used for this style of pocketknife in general (compare usage of 🇨🇬 or ). This sense is first cited in 1931.

Noun

 * 1)   the Governor of Higo
 * 2)  a type of Japanese folding pocketknife