Backfilling
material used for refilling an excavation.
to refill (an excavation).
Historical Examples
These also were temporarily useless, because there had been no dredging in front of them, or backfilling in their rear.
The Philippines Past and Present (Volume 2 of 2) Dean Conant Worcester
verb
(transitive) to refill an excavated trench, esp (in archaeology) at the end of an investigation
noun
the soil used to do this
n.
1901 (as backfilling), from back (adj.) + fill (n.). The verb was in use by 1930.
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