sharpen
v 1: make sharp or sharper, as of 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}]