from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An undercover investigator; a police spy, especially in a French-speaking country.

from The Century Dictionary and Cyclopedia

  • n. In France, a police-spy.


From French mouchard, from mouche ‘fly’. (Wiktionary)


  • Not a "mouchard" tracked us; none even looked after us as we went.

    Harper's New Monthly Magazine, Vol. 3, July, 1851

  • The Frenchman cherished all the traditional hatred of his race for the profession of "mouchard," and would not be able to understand that a detective was of a higher standing.

    The Secret Passage

  • If any man should be aware of the uses and sweets of friendship, is it not the moral leper known to the world as a spy, to the mob as a _mouchard_, to the department as an “agent”?

    Scenes from a Courtesan's Life

  • It was not the porter who spoke now: it was some kind of official relic or shadow or mouchard left from the old custom-house, and suffered to hang on the railway-station as an ornament.

    Lippincott's Magazine of Popular Literature and Science, Vol. 12, No. 32, November, 1873

  • Returning down the Rue de la Harpe before our house my landlady exclaimed to me in alarm, "Hide your pistols! there is a _mouchard_ (spy of the police) following you."


  • I believe that I, my blood being up, said something to the effect that if she would point him out I would shoot him forthwith, but the _mouchard_ had vanished.


  • He did it very well, too — much better than you would have expected from so apparently unwieldy a _mouchard_.

    A Stable for Nightmares or Weird Tales

  • It is not easy to give a notion of his conduct under the Consulate and the Empire without borrowing such words as mouchard and mouton.

    Miscellaneous Writings and Speeches — Volume 2

  • It is not easy to give a notion of his conduct under the Consulate and the Empire without borrowing such words as _mouchard_ and _mouton_.

    Critical and Historical Essays, Volume III (of 3)

  • I turned round with astonishment; but the ambulating book-vender had vanished, in consequence, as I conclude, of being observed by some _mouchard.

    Paris as It Was and as It Is


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  • To keep a secret has always been hard
    But when in France be on your guard.
    Along with the shrug
    They invented the bug.
    That fly on the wall could be a mouchard.

    June 19, 2014