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


  • (US) To provide reserve support.
  • (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.
  • To refill a hole with the material dug out of it.
  • (US) To replenish or restock due to attrition or loss.

    "The company backfilled Joe's position after he was terminated."

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