Definition of muck up phrasal verb from the Oxford Advanced American Dictionary

 

muck up

 phrasal verb
phrasal verb
 
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Phrasal Verbs

    muck somethingup

    (informal)
     
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  1. 1to do something badly so that you fail to achieve what you wanted or hoped to achieve synonym mess something up He completely mucked up his English exam.
  2. 2to spoil a plan or an arrangement synonym mess something up
  3. 3to make something dirty I don't want you mucking up my nice clean floor.
See the Oxford Advanced Learner's Dictionary entry: muck up