day job
From Longman Dictionary of Contemporary Englishday jobˈday job noun [countable] your normal job which you earn most of your money from doing, especially as opposed to another interest I’d love to be a professional writer, but I’m not giving up my day job just yet.Examples from the Corpusday job• Bennett kept his day job and concentrated on his main art pursuit, collages.• He has kept his day job.• Now he's prepared to give up his day job to chase the dream.• Don't give up your day job said some one.