Source : WordNet®

bollix up
     v : make a mess of, destroy or ruin; "I botched the dinner and
         we had to eat out"; "the pianist screwed up the difficult
         passage in the second movement" [syn: {botch}, {bumble},
         {fumble}, {botch up}, {muff}, {blow}, {flub}, {screw up},
          {ball up}, {spoil}, {muck up}, {bungle}, {fluff}, {bollix},
          {bollocks}, {bollocks up}, {bobble}, {mishandle}, {louse
         up}, {foul up}, {mess up}, {fuck up}]