Simple past tense and past participle of backfill.(verb)
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Use "backfilled" in a sentence
"Excavation units also need to be "backfilled" at the end of the season, even ones we intend to work in again."
"The district's 2009-10 deficit was $2.3 million, part of which was "backfilled" with"
"Legislature "backfilled" state department budgets with various one-time monies, warning state executive bosses that one-time money would not be coming again and that they should begin to trim spending."