WordWeb Online

1. Make a mess of, destroy or ruin
   "I mucked up the dinner and we had to eat out";
   - botch, bodge [Brit, informal], bumble, fumble, botch up, muff [informal], blow, flub [N. Amer, informal], screw up [informal], spoil, bungle, fluff [informal], bobble [N. Amer], mishandle, louse up [informal], foul up, mess up, butcher, goof up [informal], cock up [Brit, informal], balls up [informal], make a hash of [informal]
    
2. Soil with mud, muck, or mire
   "The child mucked up his shirt while playing ball in the garden";
   - mire, muck, mud

Derived forms: mucked up, mucking up, mucks up

Type of: begrime, bemire [archaic], colly [archaic], dirty, fail, go wrong, grime, miscarry, soil