"Sharpening is the process of creating or refining 2 perpendicular axis into a converging "Apex" creating an edge of appropriate shape on a tool or implement ...
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designed for cutting. Sharpening is done by removing material on an implement with an abrasive substance harder than the material of the implement, followed sometimes by processes to polish/hone the sharp surface to increase smoothness." - (en.wikipedia.org 05.04.2022)