make or become sharp 削尖;磨尖;磨快;变尖;变锋利;尖锐化;急剧化 [withobj.]she sharpened her pencil. 她削尖铅笔。 [noobj.]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 [noobj.]they've got to sharpen up in front of the goal. 他们临门一脚还需要提高。 [withobj.]students will sharpen up their reading skills. 学生们要改进他们的阅读技巧。