释义
crush a piece of paper or fabric into a tight mass
把纸（或织物）揉成一团。
tense the muscles of one's face or around one's eyes, typically so as to register an emotion or because of bright light
使（面部或眼睛周围的肌肉，尤指为表达情感或因强光刺激）收缩；皱紧。
〈非正式〉使失败；使出问题
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why are you trying to screw up your life? 你为什么要把生活搞得一团糟？
summon up one's courage
鼓起勇气
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now Stephen had to screw up his courage and confess .现在斯蒂芬不得不鼓起勇气承认。