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Longman Dictionary of Contemporary English
day job
noun
EXAMPLES FROM CORPUS
▪ Bennett kept his day job and concentrated on his main art pursuit, collages.
▪ Don't give up your day job said some one.
▪ He has kept his day job.
▪ Now he's prepared to give up his day job to chase the dream.
Wiktionary
day job

alt. One's main mean of income, during the daytime. n. One's main mean of income, during the daytime.

Wikipedia
Day Job

Day Job is the fourth studio album by Canadian country music artist Gord Bamford. It was released on April 6, 2010 by Royalty Records. Its first single was the title track.

Day Job (Suburban Legends album)

Day Job is Suburban Legends' fifth album, released on April 3, 2012. Aaron Bertram, Brian Robertson, Derek Rock, and Vincent Walker appeared on local online radio program TNN Radio to announce the album on February 18, 2012.

The band's first full-length album since 2008's Let's Be Friends and Slay the Dragon Together, Day Job has been heavily promoted by band as a fully ska album, following several releases that explored disco, funk, and pop rock. Included in the release are four re-recorded tracks from the 2010 EP Going on Tour, songs originally intended from earlier releases such as "Take the Next Step," which was written originally for 2003's Rump Shaker, as well as three songs which the band has long performed live with no previous studio recording: "Girlfriend's Pretty," which was first performed live no later than 2005, and two Disney covers: The Little Mermaid's " Under the Sea" and The Lion King's " I Just Can't Wait to Be King."

Suburban Legends held a formal release party show for the album on May 4, 2012, at Chain Reaction in Anaheim, California, with local bands The Originalites, The Long Holidays, and Hooray for Our Side.

Usage examples of "day job".

Trying to take down the defenses in a normal manner would be a several-day job.

By way of a day job, he's a lawyer and he lives in Preston, England with his wife and children.

And butting heads with the army, even to get them to tell us to get out and leave them alone, is likely to be an all-day job.

Fairchild would have appreciated the names, but I wanted her to keep believing that my story of a day job teaching was a clever ruse and, in real life, I was her full-time investigator.

Lets just say, if I quit my day job, my bosses would have a lot of surgery to do to reclaim their property.

Asked for night work because she had a day job over at the Best Western in Palmdale.

They defended Doc from what could easily become a twenty-four-hour-a-day job of interviewing persons with piddling problems—.