Backfills

The word 'backfills' or 'backfill' can have a number of different meanings, but is generally understood to mean, to refill a trench in the ground, or the material or soil used to refill an area which has been excavated.. The free dictionary defines 'backfill' as:

1. Material used to refill an excavated area.
2. To refill (an excavated area) with such material.