sharpen (
http://definr.com/sharpen)
v 1: make sharp or sharper; "sharpen the knives" [ant:
dull]
2: make sharp or sharper; "We had to sharpen our arguments"
3: become sharp or sharper; "The debate sharpened"
4: put into focus; as of an image on a screen; "Please focus
the image; we cannot enjoy the movie" [syn:
focus] [ant:
blur]
5: make sharp or sharper of images and sounds [ant:
soften]
6: raise the pitch of (musical notes) [ant:
flatten]
7: give a point to; "The candles are tapered" [syn:
taper,
point]
8: make more acute; as of one's senses; "This drug will sharpen
your vision" [syn:
heighten]