· make sharp or sharper; "sharpen the knives"

Hypernym(s): change, alter, modify

Antonym(s): dull

· make crisp or more crisp and precise; "We had to sharpen our arguments"

Hypernym(s): intensify, compound, heighten, deepen

· become sharp or sharper; "The debate sharpened"

Hypernym(s): intensify, deepen

· put (an image) into focus; "Please focus the image; we cannot enjoy the movie"

Synonym(s): focus, focalize, focalise

Hypernym(s): adjust, set, correct

· make (images or sounds) sharp or sharper

Hypernym(s): change_intensity

Antonym(s): soften

· raise the pitch of (musical notes)

Hypernym(s): change, alter, modify

Antonym(s): flatten

· give a point to; "The candles are tapered"

Synonym(s): taper, point

Hypernym(s): change_shape, change_form, deform

· make (one's senses) more acute; "This drug will sharpen your vision"

Synonym(s): heighten

Hypernym(s): intensify, compound, heighten, deepen