Source : WordNet®

muck up
     v 1: 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}, {bungle}, {fluff}, {bollix},
           {bollix up}, {bollocks}, {bollocks up}, {bobble}, {mishandle},
           {louse up}, {foul up}, {mess up}, {fuck up}]
     2: soil with mud, muck, or mire; "The child mucked up his shirt
        while playing ball in the garden" [syn: {mire}, {muck}, {mud}]