DuckCorp Dico

Found one definition

1.                 From English - German Ding/FreeDict dictionary ver. 1.9-fd1:
                   
   
   
                   
                     
   bone up /bˈəʊn ˈʌp/
   einen Stoff büffeln, pauken [Dt.] , bimsen, stucken [Bayr.]  [Ös.] , asten <v, trans> [Jugendsprache]  [school]  [stud.]
         "bone up on maths"  - Mathe büffeln, Mathe pauken
      Synonyms: swot up, mug up on a subject matter