Meaning
To refill a hole with the material dug out of it.
Etymology
Origin: Old English
Etymology tree Proto-Indo-European *bʰeg-der.? Proto-Germanic *baką Proto-West Germanic *bak Old English bæc Middle English bak English back English fill English backfill From back + fill.
NYT Puzzle Appearances
Accepted in 3 recorded puzzles, including a pangram: