poisson d'avril

Literally, “April fish”. Compare Italian pesce d'aprile, Portuguese peixe de abril. From the practical joke played on April Fools', of pinning a fish to the back of a person.

• IPA^(key): /pwa.sɔ̃ d‿a.vʁil/

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poisson d’avril m (plural poissons d’avril)

1. April fool (an April Fool's Day joke)
   • 1843, Théodore de Jolimont, "Monologie du mois d'avril", in L'Art en Provence, vol. 7, section IV (unnumbered page).

     Ces poissons d’avril qui font grincer les dents, maugréer et maudire, et que dame Justice n’épargne guère aux incorrigibles plaideurs;

     (please add an English translation of this quotation)

2. April fool (a person subjected to an April Fool's Day joke)
3. paper fish pinned to someone's back as a traditional April Fool's Day joke

• → Dutch: aprilvis (calque)