What is the meaning of the word "sharpen"?

Definitions:

  1. become sharp or sharper copy to clipboard verb
    • The debate sharpened copy to clipboard
  2. make (one's senses) more acute copy to clipboard verb
    • This drug will sharpen your vision copy to clipboard
  3. make crisp or more crisp and precise copy to clipboard verb
    • We had to sharpen our arguments copy to clipboard
  4. make sharp or sharper copy to clipboard verb
    • sharpen the knives copy to clipboard

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