Definition of backfill verb from the Oxford Advanced Learner's Dictionary

 

backfill

 verb
verb
BrE BrE//ˈbækfɪl//
 
; NAmE NAmE//ˈbækfɪl//
 
Verb Forms present simple I / you / we / they backfill
BrE BrE//ˈbækfɪl//
 
; NAmE NAmE//ˈbækfɪl//
 
he / she / it backfills
BrE BrE//ˈbækfɪlz//
 
; NAmE NAmE//ˈbækfɪlz//
 
past simple backfilled
BrE BrE//ˈbækfɪld//
 
; NAmE NAmE//ˈbækfɪld//
 
past participle backfilled
BrE BrE//ˈbækfɪld//
 
; NAmE NAmE//ˈbækfɪld//
 
-ing form backfilling
BrE BrE//ˈbækfɪlɪŋ//
 
; NAmE NAmE//ˈbækfɪlɪŋ//
 
 
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backfill something to fill a hole with the material that has been dug out of it
See the Oxford Advanced American Dictionary entry: backfill