Etymology

pur sang

Today it means: Beyond doubt or being a model example; the ne plus ultra or epitome; the definitive. Full definition →

French pur-sang
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The story

  1. French · borrowed frompur-sang“pure blood or thoroughbred (as used of a horse)”
  2. English todaypur sang

From French pur-sang (“pure blood or thoroughbred (as used of a horse)”), from pur (“pure”) and sang (“blood”).

Etymology from Wiktionary, CC BY-SA 4.0.