What is the meaning of sharpen?

verb

• Make sharp or sharper.
  • usage: "sharpen the knives"
• Make crisp or more crisp and precise.
  • usage: "We had to sharpen our arguments"
• Become sharp or sharper.
  • usage: "The debate sharpened"
• Put (an image) into focus.
  • usage: "Please focus the image; we cannot enjoy the movie"
  • synonyms: focus, focalize, focalise
• Make (images or sounds) sharp or sharper.
• Raise the pitch of (musical notes. )
• Give a point to.
  • usage: "The candles are tapered"
  • synonyms: taper, point
• Make (one's senses) more acute.
  • usage: "This drug will sharpen your vision"
  • synonyms: heighten