Definition of mess around with phrasal verb from the Oxford Advanced Learner's Dictionary

 

mess around with

 phrasal verb
phrasal verb
 
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Phrasal Verbs

mess around with somebody

(British English also mess about with somebody)
 
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to have a sexual relationship with somebody, especially when you should not

    mess around with something

    (British English also mess about with something)
     
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  1. 1to touch or use something in a careless and/or annoying way Who's been messing around with my computer?
  2. 2to spend time playing with something, repairing something, etc.
See the Oxford Advanced American Dictionary entry: mess around with