Verb
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make (one's senses) more acute
"This drug will sharpen your vision"
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give a point to
"The candles are tapered"
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raise the pitch of (musical notes)
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make (images or sounds) sharp or sharper
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put (an image) into focus
"Please focus the image
we cannot enjoy the movie"
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become sharp or sharper
"The debate sharpened"
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make crisp or more crisp and precise
"We had to sharpen our arguments"
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make sharp or sharper
"sharpen the knives"