sharpen

动词 sharpen:

1. make sharp or sharper
2. make sharp or sharper
3. become sharp or sharper
4. put (an image) into focus
   同义词：focus, focalize, focalise
5. make (images or sounds) sharp or sharper
6. raise the pitch of (musical notes)
7. give a point to
   同义词：taper, point
8. make (one's senses) more acute
   同义词：heighten

1. My pencil is blunt, could you lend me a knife to sharpen it?
   我的铅笔钝了，你能借我把刀子削一削吗？
2. The soldiers sharpened up their knives.
   战士们把刀磨得锋利。
3. Generations of urban living sharpened their wits.
   世代居住在城市里使他们磨练了才智。