Good earner
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[Mafioso] slang for a mob employee who is a hard worker and of [good value] to the family. Typically someone is considered a good earner because they bring in more money to the organization than they take out. An employee could also be considered a good earner if he/she exhibits a special [skill set], such as a keen ability to remember numbers, or being very good at killing people.
Good earner meaning & definition 1 of Good earner.