Etymology

thereby

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Today it means: By it; by that; by that means, or as a consequence of that. Full definition →

Middle English therby ← Old English ðǣrbig
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The story

  1. Old English · inherited fromðǣrbig
  2. Middle English · inherited fromtherby
  3. English todaythereby

From Middle English therby, from Old English ðǣrbig, equivalent to there + by. Compare the parallel formation of German dabei.

Etymology from Wiktionary, CC BY-SA 4.0.