sharpen

(verb) make sharp or sharper. Example: "Sharpen the knives."

(verb) make crisp or more crisp and precise. Example: "We had to sharpen our arguments."

(verb) become sharp or sharper. Example: "The debate sharpened."

(verb) put (an image) into focus. Synonyms: focus, focalize, focalise. Example: "Please focus the image; we cannot enjoy the movie."

(verb) make (images or sounds) sharp or sharper.

(verb) raise the pitch of (musical notes).

(verb) give a point to. Synonyms: taper, point. Example: "The candles are tapered."

(verb) make (one's senses) more acute. Synonyms: heighten. Example: "This drug will sharpen your vision."