WordWeb Online

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

Derived forms: mucking up, mucked up, mucks up

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