backfill
noun
Definitions
The material that has been used to refill an excavation.
Reserve support personnel.
That which backfills; a replacement.
Material in a story set earlier in the past, providing history or context for the current action.
verb
Definitions
To refill a hole with the material dug out of it.
To refill an excavation unit to restore the former ground surface and/or to preserve the unit and make it recognizable as having been excavated.
To provide reserve support.
To replenish or restock due to attrition or loss.
Example: The company backfilled Joe's position after he was terminated.