sharpen

make (one's senses) more acute

“This drug will sharpen your vision”

put (an image) into focus

give a point to

become sharp or sharper

“The debate sharpened”

make crisp or more crisp and precise

“We had to sharpen our arguments”

make (images or sounds) sharp or sharper

make sharp or sharper

“sharpen the knives”

raise the pitch of (musical notes)