One’s primary employment and source of income, usually during the business day. The term refers to those who would like to pursue another activity, such as singing or acting or creative writing or a sport, which does not earn them much and is done principally at night and on weekends. “Don’t quit your day job” is a humorous response to an inadequate performance. It was said in the film The Kids Are All Right (2010) by the son when his mother sang a song.