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

 

fool around

 phrasal verb
phrasal verb
 
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Phrasal Verbs
  1. 1(British English also fool about) to waste time instead of doing something that you should be doing synonym mess around
  2. 2fool around (with somebody) to have a sexual relationship with another person’s partner; to have a sexual relationship with somebody who is not your partner synonym mess around She's been fooling around with a married man.
See the Oxford Advanced American Dictionary entry: fool around