the paid work that somebody normally does 日常的有薪工作；（白天的）正职
Idioms
don’t give up the day job
- (informal, humorous)
used to tell somebody that they should continue doing what they are used to, rather than trying something new that they are likely to fail at 别放弃白天的正职（别放弃老本行去尝试没有把握的新事物） So you want to be a writer? Well my advice is, don't give up the day job. 这么说你想成为一个作家了？得了，我劝你不要放弃老本行。