Definition of day job noun from the Oxford Advanced Learner's Dictionary

 

day job

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