Etymology

Grande Coupure

Today it means: The Eocene–Oligocene extinction event. Full definition →

French grand coupure
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The story

  1. French · borrowed fromgrand coupure
  2. English todayGrande Coupure

Borrowed from French grand coupure, which means "great cut", consisting of grand (“big”) and coupure (“cut, interruption”).

Etymology from Wiktionary, CC BY-SA 4.0.