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Also known as Sharpen

thumb|A hand-held tungsten carbide knife sharpener, with a finger guard, can be used for sharpening plain and serrated edges on [[pocket knives and multi-tools.]]Sharpening is the process of creating or refining a sharp edge of appropriate shape on a tool or implement designed for cutting. Sharpening is done by removing material from the implement with an abrasive substance harder than the material of the implement, followed sometimes by processes to polish the sharp surface to increase smoothness and correct small mechanical deformations without removing significant metal.