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 focus the image; we cannot enjoy the movie

[ Syn: focus , focalize , focalise ]

make (images or sounds) sharp or sharper

raise the pitch of (musical notes)

give a point to; The candles are tapered

[ Syn: taper , point ]

make (ones senses) more acute; This drug will sharpen your vision

[ Syn: heighten ]