spear carrier; spear bearer
Historical term for a servant who carried the spear for a samurai master. Archaic in modern usage; encountered in historical contexts or period dramas.
In period dramas, you often see a scene where a spear carrier stands behind his master.
Compound of 槍 (spear) and 持ち (carrier, from 持つ 'to hold'). The exact historical derivation is straightforward.