sharpen
v[I, Tn]
(cause sth to) become sharp (使某物)锋利, 尖锐, 陡峭, 清晰, 强烈
The tone of his letters has sharpened (ie become less friendly) recently. 他最近来信的口气变得刻薄起来.
sharpen a pencil 削铅笔
This knife needs sharpening. 这把刀要磨一下.
This incident has sharpened public awareness of the economic crisis. 这件事提高了公众对经济危机的认识.
sharpen sb's wits, ie make sb more mentally alert 使某人更机智.
🌿 同词根单词
shiftvt.& vi. 改变;去掉;摆脱掉;换挡;
vt. 换…的衣服,更(衣);卖,出售;[计算机]使(数据)位移;
vi. (汽车)换挡;换衣服;蒙混;自己谋生;
n. 移动,转移,转换;变迁,变化,变换,替换,更换,掉换,更易,代用;(汽车等的)变速;