re-retire

verb2

1. •
   To retire again.

   • He re-retired after being unretired for a while. His unretirement was worth his while, but he plans to stay retired this time.
2. •
   To bring (something or someone) back from retirement.

   • We re-retired this machine because our newest equipment truly obviates it, and there's no realistic prospect that it will ever save us any money in the future.