The ability to project the slashing effect of bladed weapons. Not to be confused with Razor Wind.
Flying Slash Attack (One Piece)
The user's slashing attacks travel forward from the blade as if they where a projectile. The projection also apply each weapon's specific properties, possibly enhanced further by the user's own abilities: infusions (fire, electricity, ice, light, darkness, etc.), effects on touch (death, disintegration, petrification, absorption, corruption), and various others.
Rather than simply creating razor-sharp air currents via movement pressure, this actually act as an extension of the blade, carrying its sharpness and properties to a range longer than the physical weapon.