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mug up on

phrasal verb
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mug something up | mug up on something
  1. (British English, informal) to learn something, especially in a short time for a particular purpose, for example an exam突击式学习
    • You just need to mug up a few details.您只需要弄清楚一些细节。
    • He’s frantically mugging up on Japanese before his trip to Tokyo.在前往东京之前，他疯狂地准备日语。