back-fill

backfill

[bak-fil]
noun
1.
material used for refilling an excavation.
verb (used with object)
2.
to refill (an excavation).

Origin:
1950–55; back2 + fill

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World English Dictionary
backfill (ˈbækˌfɪl)
 
vb
1.  (tr) to refill an excavated trench, esp (in archaeology) at the end of an investigation
 
n
2.  the soil used to do this

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

backfill
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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