nixer

From nix +‎ -er.

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nixer (plural nixers)

1. (Ireland, slang) A job or income which is in addition to one's normal employment, generally done in the evening or on weekends; originally, work for payment that was not declared for taxation, now any work that is not part of one's regular job.
   • 2000, Patricia Scanlan, City Lives, Random House (Bantam Books), page 385,

     'Ciara, you were getting very well paid. Over the odds in fact. And doing the odd nixer is a hell of a lot different from defrauding your employers,' Devlin retorted angrily.

   • 2002 , Ullrich Kockel, Regional Culture and Economic Development, 2017, Taylor & Francis (Routledge), page 51,

     Although this advice was given with a view to allowing Séamus to continue in farming while maintaining his factory job, the success of this innovation, which was largely financed by savings facilitated through ‘nixers’ and poteen sales – was such that Séamus quit his job, and is now enjoying a higher level of total income than before: His flock productivity has almost doubled, and quality improved considerably as the weaning rate rose.

   • 2024, Seamus O'Rourke, Leaning on Gates, Gill (Gill Books), unnumbered page,

     He asked me if I was interested in doing a nixer. I didn't know what a nixer was. I was so sheltered in my little safe nine-to-five working world that I didn't realise there was another world out there with less emphasis on clock-watching and more on making money.

     'A nixer – a couple of evenings' work for cash.'

     'Oh,' I said, 'that sounds good to me.'

• under the counter
• off the books
• side hustle

nīxer

1. first-person singular present active subjunctive of nīxor