Backfill
material used for refilling an excavation.
to refill (an excavation).
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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a karate punch with the back of a clenched hand.
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a flashback: Backflashes of the heroine’s childhood fill in gaps in the novel’s narrative.