1. (verb) sharpen
make sharp or sharper
Synonyms: focus, focalize, taper, focalise, heighten, point
Antonyms: dull, soften, flatten, blunt, drop
2. (verb) sharpen
make crisp or more crisp and precise
Synonyms: focus, focalize, taper, focalise, heighten, point
Antonyms: dull, drop, soften, blunt, flatten
3. (verb) sharpen
become sharp or sharper
Synonyms: focus, focalize, taper, focalise, heighten, point
Antonyms: soften, blunt, flatten, dull, drop
4. (verb) focus, focalize, focalise, sharpen
put (an image) into focus
Synonyms: center, rivet, concentrate, localise, localize, sharpen, centre, focalise, concentre, taper, point, pore, focalize, focus, heighten, concenter
Antonyms: flatten, dull, blunt, soften, drop
5. (verb) sharpen
make (images or sounds) sharp or sharper
Synonyms: focus, focalize, taper, focalise, heighten, point
Antonyms: flatten, soften, drop, dull, blunt
6. (verb) sharpen
raise the pitch of (musical notes)
Synonyms: focus, focalize, taper, focalise, heighten, point
Antonyms: soften, drop, flatten, blunt, dull
7. (verb) sharpen, taper, point
give a point to
Synonyms: manoeuvre, manoeuver, focus, head, bespeak, indicate, aim, betoken, maneuver, place, taper, luff, designate, sharpen, guide, repoint, heighten, focalise, direct, channelize, focalize, point, charge, channelise, target, steer, signal, level, orient, show
Antonyms: dull, drop, flatten, blunt, soften
8. (verb) sharpen, heighten
make (one's senses) more acute
Synonyms: taper, enhance, compound, rise, focalise, point, heighten, sharpen, raise, focalize, focus, intensify, deepen
Antonyms: drop, blunt, soften, flatten, dull
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Synonyms for sharpen 
