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New American Oxford Dictionary

backfill

back fill |ˈbakˌfil ˈbækfɪl | ▶verb [ with obj. ] refill (an excavated hole ) with the material dug out of it: they backfill the hole to street level. ▶noun material used for backfilling.

 

Oxford Dictionary

backfill

back |fill |ˈbakfɪl | ▶verb [ with obj. ] refill (an excavated hole ) with the material dug out of it. ▶noun [ mass noun ] material used for backfilling.