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