Definition of day job noun from the Oxford Advanced American Dictionary

 

day job

 noun
noun
 
[singular]
 
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  • the paid work that someone normally does
  • Idioms
    don't give up the/your day job(informal)(humorous)
     
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    used to tell someone that they should continue doing what they are used to, rather than trying something new that they are likely to fail at So you want to be a writer? Well my advice is, don't give up your day job.
    See the Oxford Advanced Learner's Dictionary entry: day job