Etymology

pièce de conviction

Today it means: An incriminating exhibit shown as evidence in a criminal case. Full definition →

French pièce de conviction
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The story

  1. French · borrowed frompièce de conviction
  2. English todaypièce de conviction

Borrowed from French pièce de conviction; first use appeared c. 1840.

Etymology from Wiktionary, CC BY-SA 4.0.