backfill

Etymology
From.

Verb

 * 1) To refill a hole with the material dug out of it.
 * 2)  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.
 * 3) * We backfilled the cistern with pea gravel to discourage its use as a refuse container.
 * 4)  To provide reserve support.
 * 5)  To replenish or restock due to attrition or loss.
 * The company backfilled Joe's position after he was terminated.
 * 1)  To enter an online game that's already in progress, replacing a player who left early.
 * 1)  To enter an online game that's already in progress, replacing a player who left early.

Noun

 * 1) The material that has been used to refill an excavation.
 * 2)  Reserve support personnel.
 * 3)  That which backfills; a replacement.
 * 4)  Material in a story set earlier in the past, providing history or context for the current action.

Derived terms

 * backfill bias