Definition of mess verb from the Oxford Advanced American Dictionary

     

    mess

     verb
    verb
    NAmE//mɛs//
     
    Verb Forms present simple I / you / we / they mess
     
    he / she / it messes
     
    past simple messed
     
    -ing form messing
     
     
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    make untidy
  1. 1 [transitive] mess something (informal) to make something dirty or not neat Careful—you're messing my hair.
  2. of an animal
  3. 2[intransitive] to empty its bowels somewhere that it should not
  4. Idioms
    not mess around(informal)
     
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    to do something quickly, efficiently, or in the right way When they decide to have a party they don't mess around.
    Phrasal Verbsmess aroundmess around with somebodymess around with somethingmess upmess somebodyupmess somethingupmess with somebody/something
See the Oxford Advanced Learner's Dictionary entry: mess