sharpen

verb

1. make sharp or sharper

   verb.contact

   Examples

   Sharpen the knives.

   Antonyms blunt dull

   Source: WordNet 3.0

2. make crisp or more crisp and precise

   verb.change

   Examples

   We had to sharpen our arguments.

   Source: WordNet 3.0

3. become sharp or sharper

   verb.change

   Examples

   The debate sharpened.

   Source: WordNet 3.0

4. put (an image) into focus

   verb.change

   Synonyms focalise focalize focus

   Antonyms blear blur

   Source: WordNet 3.0

5. make (images or sounds) sharp or sharper

   verb.perception

   Antonyms soften

   Source: WordNet 3.0

6. raise the pitch of (musical notes)

   verb.change

   Antonyms drop flatten

   Source: WordNet 3.0

7. give a point to

   verb.change

   Synonyms point taper

   Source: WordNet 3.0

8. make (one's senses) more acute

   verb.change

   Examples

   This drug will sharpen your vision.

   Synonyms heighten

   Source: WordNet 3.0

9. To make sharp.

   verb

   Source: webster1913

10. To grow or become sharp.

    verb

    Source: webster1913