To mug up something (or mug something up) is to try and quickly learn the important information about something, for example before an exam or a meeting. British English, informal.
Example of use:
Amelia hasn’t done much studying so she is trying to mug up on the key points before her exam tomorrow.
infinitive – mug up
present simple – mug up and mugs up
-ing form – mugging up
past simple – mugged up
past participle – mugged up
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