Etymology

backfill

B3A1C3K5F4I1L1L1

Today it means: To refill a hole with the material dug out of it. Full definition →

English fill ← Middle English bak ← Old English bæc
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The story

  1. Proto-Indo-European*bʰeg-der.?
  2. Proto-Germanic*baką
  3. Proto-West Germanic*bak
  4. Old Englishbæc
  5. Middle Englishbak
  6. Englishback
  7. Englishfill
  8. English todaybackfill

From back + fill.

Etymology from Wiktionary, CC BY-SA 4.0.