Etymology

downstream

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Today it means: Toward the lower part of a stream; with the current (of a river, brook, or other flow of fluid). Full definition →

English stream ← Middle English strem ← Old English strēam
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The story

  1. Englishdown-
  2. Proto-Indo-European*ser-?
  3. Proto-Indo-European*srew-
  4. Proto-Indo-European*srow-mo-s
  5. Proto-Germanic*straumaz
  6. Proto-West Germanic*straum
  7. Old Englishstrēam
  8. Middle Englishstrem
  9. Englishstream
  10. English todaydownstream

From down- + stream.

Etymology from Wiktionary, CC BY-SA 4.0.