Definition of muck up phrasal verb from the Oxford Advanced Learner's Dictionary

 

muck up

 phrasal verb
phrasal verb
 
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Phrasal Verbs

    muck somethingup

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