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backfill

[bak-fil] /ˈbækˌfɪl/
noun
1.
material used for refilling an excavation.
verb (used with object)
2.
to refill (an excavation).
Origin of backfill
1950-1955
First recorded in 1950-55; back2 + fill
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for backfill

backfill

/ˈbækˌfɪl/
verb
1.
(transitive) to refill an excavated trench, esp (in archaeology) at the end of an investigation
noun
2.
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
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Word Origin and History for backfill
n.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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