Etymology

underside

U1N1D2E1R1S1I1D2E1

Today it means: The side that is below or underneath, the bottom. Full definition →

English side ← Middle English side ← Old English sīde
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The story

  1. Proto-Indo-European*h₁én
  2. Proto-Indo-European*h₁entér
  3. Proto-Indo-European*h₂én
  4. Proto-Indo-European*dʰeh₁-?
  5. Proto-Indo-European*(H)n̥dʰí
  6. Proto-Indo-European*(H)n̥dʰér
  7. Proto-Germanic*under
  8. Proto-West Germanic*undar
  9. Old Englishunder-
  10. Middle Englishunder-
  11. Englishunder-
  12. Proto-Indo-European*seh₁-
  13. Proto-Germanic*sīdaz
  14. Proto-Germanic*sīdǭ
  15. Old Englishsīde
  16. Middle Englishside
  17. Englishside
  18. English todayunderside

From under- + side.

Etymology from Wiktionary, CC BY-SA 4.0.