Definition & Meaning of "nixer"in English

What does "nixer" mean in Irish slang?

In Irish slang, "nixer" refers to a side job or unofficial work done for cash outside of regular employment. It is commonly used in Ireland in everyday speech, especially in working-class contexts where informal or undeclared work is discussed. The term became widely used in 20th-century Irish English, particularly in relation to "cash-in-hand" labour such as building, repairs, or small jobs done privately. It is used casually and can be neutral or slightly critical depending on context, often implying work done outside formal tax or employment systems.