Definition of field day noun from the Oxford Advanced American Dictionary

 

field day

 noun
noun
 
 
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  • a special day at school when there are no classes and children compete in sports events
  • Idioms
    have a field day
     
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    to be given the opportunity to do something that you enjoy, especially something that other people do not approve of The media had a field day with the latest insider trading scandal. Shoplifters appear to have had a field day at the mall opening.
    See the Oxford Advanced Learner's Dictionary entry: field day