Etymology

knowest

K5N1O1W4E1S1T1
English know ← Middle English knowen ← Old English cnāwan
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The story

  1. Proto-Indo-European*ǵneh₃-
  2. Proto-Germanic*knēaną
  3. Proto-West Germanic*knāan
  4. Old Englishcnāwan
  5. Middle Englishknowen
  6. Englishknow
  7. English todayknowest

From know + -est.

Etymology from Wiktionary, CC BY-SA 4.0.