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brush up on

 
See:
brush
part of speech: phrase
definition: to study again to bring one's knowledge up to date or to remember what might have been forgotten; review.
I know this stuff pretty well, but I should probably brush up a bit before the exam.I'm going to Paris next month, so I'm trying to brush up on my French.I'm brushing up on the timetable because some things have changed.
synonyms:
review
similar words:
cram, study, update