part-timer

From part-time + -er.

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part-timer (plural part-timers)

1. Someone who is employed, or does something, part-time.
   • 1963 June, “A Bus Operator's View of Beeching”, in Modern Railways, page 373:

     After all, the train crews can be employed on freight work for the rest of the year, while the extra bus-drivers would have to be part-timers, which is undesirable practice for a number of reasons, including safety.

2. (cricket) A part-time bowler.

• part-time employee
• part-time worker