Etymology

countersign

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Today it means: A second signature added to a document to affirm the validity of the signature of the first person. Full definition →

Middle French contresigne
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The story

  1. Middle French · derived fromcontresigne
  2. English todaycountersign

From Middle French contresigne. Equivalent to counter- + sign.

Etymology from Wiktionary, CC BY-SA 4.0.