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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

(transitive) to refill an excavated trench, esp (in archaeology) at the end of an investigation
the soil used to do this

1901 (as backfilling), from back (adj.) + fill (n.). The verb was in use by 1930.


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