swordbearer; sword carrier
Refers to a person who carries a sword, often in a historical or ceremonial context. Not a common modern occupation.
In period dramas, there are often scenes where a swordbearer carries his lord's sword.
Compound of 刀 (katana, 'sword') and 持ち (mochi, 'carrier, holder'). The exact historical derivation is uncertain, but the word straightforwardly describes a person who carries a sword.