muck up

Bungle, damage, make a mess of, as in Don't let him write the review; he's sure to muck it up. This idiom alludes to the verb muck in the sense of "spread manure on." [Early 1900s] For a synonym, see foul up.

The verb has 2 meanings:

Meaning #1: make a mess of, destroy or ruin
  Synonyms: 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

Meaning #2: soil with mud, muck, or mire
  Synonyms: mire, muck, mud