backfill

[ bak-fil ]
/ ˈbækˌfɪl /

noun

material used for refilling an excavation.

verb (used with object)

to refill (an excavation).

Origin of backfill

First recorded in 1950–55; back2 + fill
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for backfill

backfill

/ (ˈbækˌfɪl) /

verb

(tr) to refill an excavated trench, esp (in archaeology) at the end of an investigation

noun

the soil used to do this
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012