1. 
   brush up
   refresh verb refresh one`s memory; `I reviewed the material before the test`
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=brush%20up
   
   
2. 
   brushup
   noun practice intended to polish performance or refresh the memory
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=brushup
   
   
3. 
   brushup
   1) Drill 2) Exercise 3) Practice 4) Practice session 5) Recitation 6) Review 7) Review for finals
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/brushup/1
   
   

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