Open English Wordnet
Verbs
(v)sharpenmake sharp or sharper“sharpen the knives” (v)sharpenmake crisp or more crisp and precise“We had to sharpen our arguments” (v)sharpenbecome sharp or sharper“The debate sharpened” (v)sharpenmake (images or sounds) sharp or sharper (v)sharpenraise the pitch of (musical notes) (v)sharpen, heightenmake (one's senses) more acute“This drug will sharpen your vision”