moonlight2 [intransitive] informal
to have a second job in addition to your main job, especially without the knowledge of the government tax department:
She's been moonlighting as a waitress in the evenings.
2 British EnglishBE
to do paid work although you are getting money from the government because you do not officially have a job
—moonlighter noun [countable]
—moonlighting noun [uncountable]
He's been doing some moonlighting for another company.