A tool or device used to make something sharp or sharper, like a pencil sharpener or knife sharpener.
From 'sharpen' (Old English 'scearp') plus the agent suffix '-er' (one who does the action). The root relates to cutting and keen edges.
The word 'sharp' originally meant 'having a defined edge' but evolved to describe both physical objects and mental qualities—you can have a sharp knife or a sharp mind. The sharpener works on both.
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