brush up

Verb
  1. Refresh one's memory (synset 200698618)
    "I reviewed the material before the test"
    is a type of: call back, call up, recall, recollect, remember, retrieve, think - recall knowledge from memory; have a recollection
    same as: refresh, review
  2. Bring to a highly developed, finished, or refined state (synset 200474730)
    "polish your social manners"
    is a type of: hone, perfect - make perfect or complete
    same as: polish, polish up, round, round off

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