sharpen
/ˈʃɑːpən/verb
1- make or become sharp削尖; 磨尖; 磨快; 变尖; 变锋利; （使）尖锐化; （使）急剧化：
with obj. she sharpened her pencil她削尖铅笔
no obj. her tone sharpened to exasperation.她语调变尖, 显出恼怒。
1.1
- improve or cause to improve（使）改善; （使）改进：
no obj. they've got to sharpen up in front of the goal他们临门一脚还需要提高
with obj. students will sharpen up their reading skills.学生们要改进他们的阅读技巧。
派生词