Etymology

mouchard

M3O1U1C3H4A1R1D2

Today it means: An undercover investigator; a police spy, especially in a French-speaking country. Full definition →

French mouchard
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The story

  1. French · borrowed frommouchard
  2. English todaymouchard

Borrowed from French mouchard, from mouche (“a fly”).

Etymology from Wiktionary, CC BY-SA 4.0.