The phrase "to train a replacement" means teaching someone else to do the same job or tasks that you do, so that they can take over your role in the future.
Sentences with «to train a replacement»
Additional amounts of coverage may be added in order to cover the cost of locating, hiring, and training a replacement for the key employee who was lost. (insurancescored.com)
If you aren't leaving immediately, it's always good to offer to help with the transition, and / or to help train your replacement. (thebalance.com)
Of course, I will be available to provide assistance in training my replacement and will hand over all that was my responsibility to you before I leave. (coverlettersandresume.com)