Definition of mug up phrasal verb from the Oxford Advanced Learner's Dictionary

 

mug up

 phrasal verb
phrasal verb
 
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Phrasal Verbs

mug somethingup

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mug up on something

 
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(British English, informal) to learn something, especially in a short time for a particular purpose, for example an exam You just need to mug up a few details. He’s frantically mugging up on Japanese before his trip to Tokyo.