sharpen

Verb

• make (one's senses) more acute
  • This drug will sharpen your vision
    

• give a point to
  • The candles are tapered
    

• raise the pitch of (musical notes)

• make (images or sounds) sharp or sharper

• put (an image) into focus; we cannot enjoy the movie"
  • Please focus the image
    

• become sharp or sharper
  • The debate sharpened
    

• make crisp or more crisp and precise
  • We had to sharpen our arguments
    

• make sharp or sharper
  • sharpen the knives
    

Related words

• Synonyms: 
  heighten , taper , point , focus , focalize , focalise
• Antonyms: 
  flatten , drop , soften , blur , blear , dull , blunt