Definition of Sharpen

Verb: sharpen shaa(r)-pun

Make sharp or sharper
"sharpen the knives"
Make crisp or more crisp and precise
"We had to sharpen our arguments"
Become sharp or sharper
"The debate sharpened"
Put (an image) into focus
"Please sharpen the image; we cannot enjoy the movie";
- focus, focalize, focalise [Brit]
Make (images or sounds) sharp or sharper
(music) raise the pitch of (musical notes)
Give a point to
- taper, point
Make (one's senses) more acute
"This drug will sharpen your vision";
- heighten