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

 

mess up

 phrasal verb
phrasal verb
 
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Phrasal Verbs

mess up

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mess somethingup

 
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to spoil something or do it badly I've really messed up this time. If you cancel now you'll mess up all my arrangements.

    mess somebodyup

     
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  1. 1(informal) to cause someone to have serious emotional or mental problems
  2. 2 (informal) to physically hurt someone, especially by hitting them He was messed up pretty bad by the other guy.

mess somethingup

 
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to make something dirty or not neat I don't want you messing up my nice clean kitchen.
See the Oxford Advanced Learner's Dictionary entry: mess up