Etymology

backdoor

B3A1C3K5D2O1O1R1
English door ← Middle English dore ← Old English duru
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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. Proto-Indo-European*dʰwer-
  8. Proto-Germanic*durz
  9. Proto-West Germanic*dur
  10. Old Englishduru
  11. Middle Englishdore
  12. Englishdoor
  13. English todaybackdoor

From back + door.

Etymology from Wiktionary, CC BY-SA 4.0.