brush_up
1. [ verb ] refresh one's memory
Synonyms: refresh review
Examples:

"I reviewed the material before the test"

Related terms: remember rehash refresher_course
2. [ verb ] bring to a highly developed, finished, or refined state
Synonyms: round round_off polish_up polish
Examples:

"polish your social manners"

Related terms: perfect polish
Similar spelling:   brushup
  brisk_up
  brick_up
  break_up
  brace_up
  brush_off
  brush_fire