1. Make sharp or sharper
   "sharpen the knives" 
2. Make crisp or more crisp and precise
   "We had to sharpen our arguments" 
3. Become sharp or sharper
   "The debate sharpened" 
4. Put (an image) into focus
   - focus, focalize, focalise [Brit] 
5. Make (images or sounds) sharp or sharper 
6. Raise the pitch of (musical notes) 
7. Give a point to
   - taper, point 
8. Make (one's senses) more acute
   "This drug will sharpen your vision"
   - heighten

Derived forms: sharpens, sharpened, sharpening

See also: sharpener

Type of: adjust, alter, change, change form, change intensity, change shape, compound, correct, deepen, deform, heighten, intensify, modify, set

Antonym: dull, flatten, soften

Encyclopedia: Sharpen

• unworthiness
• unworthy
• unwounded
• unwoven
• unwrap
• unwrapped
• unwrinkled
• unwritten
• unwritten law
• unyielding
• unyieldingness
• unyoke
• unzip
• up
• up and down
• up for
• up for grabs
• up here
• up in arms
• up in the air
• up quark
• up the creek
• up the stairs
• up to
• up to her neck