Etymology

terrorise

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English terror ← Middle English terrour ← Middle French terreur
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The story

  1. Proto-Indo-European*tres-
  2. Proto-Indo-European*troséyeti
  3. Proto-Italic*troseō
  4. Latinterreō
  5. Latinterror
  6. Old Frenchterreur
  7. Middle Frenchterreur
  8. Middle Englishterrour
  9. Englishterror
  10. English todayterrorise

From terror + -ise.

Etymology from Wiktionary, CC BY-SA 4.0.