SHARPENS

Make sharp or sharper

Example: "Sharpen the knives"

Make crisp or more crisp and precise

Example: "We had to sharpen our arguments"

Become sharp or sharper

Example: "The debate sharpened"

Put (an image) into focus

Example: "Please focus the image; we cannot enjoy the movie"

Make (images or sounds) sharp or sharper

Raise the pitch of (musical notes)

Give a point to

Example: "The candles are tapered"

Make (one's senses) more acute

Example: "This drug will sharpen your vision"