Backfill

Origin

From back + fill.

Full definition of backfill

Verb

1. To refill a hole with the material dug out of it.
2. (archaeology) 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.
• We backfilled the cistern with pea gravel to discourage its use as a refuse container.
3. (US) To provide reserve support.
4. (US) To replenish or restock due to attrition or loss.The company backfilled Joe's position after he was terminated.

Noun

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