"caisse noire" meaning in French

{
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "de",
            "2": "schwarze Kasse",
            "calque": "1",
            "unc": "1"
          },
          "expansion": "→? German: schwarze Kasse (calque)",
          "name": "desc"
        }
      ],
      "text": "→? German: schwarze Kasse (calque)"
    }
  ],
  "etymology_text": "The term dates from the first half of the 19th century, stemming from near-clandestine efforts by railway workers at improvised health insurance, for which they would pass around a black crate, to which each worker would contribute.\nSee the French Wikipedia article for more information.",
  "forms": [
    {
      "form": "caisses noires",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "caisse noire f (plural caisses noires)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "slush fund (money stored for illegal or dishonest purposes)"
      ],
      "id": "en-caisse_noire-fr-noun-ETg6DyXf",
      "links": [
        [
          "slush fund",
          "slush fund"
        ]
      ],
      "tags": [
        "feminine"
      ],
      "wikipedia": [
        "fr:caisse noire"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "LL-Q150 (fra)-LoquaxFR-caisse noire.wav",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/7/7d/LL-Q150_%28fra%29-LoquaxFR-caisse_noire.wav/LL-Q150_%28fra%29-LoquaxFR-caisse_noire.wav.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/7/7d/LL-Q150_%28fra%29-LoquaxFR-caisse_noire.wav/LL-Q150_%28fra%29-LoquaxFR-caisse_noire.wav.ogg"
    },
    {
      "audio": "LL-Q150 (fra)-DenisdeShawi-caisse noire.wav",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/b/b5/LL-Q150_%28fra%29-DenisdeShawi-caisse_noire.wav/LL-Q150_%28fra%29-DenisdeShawi-caisse_noire.wav.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/b/b5/LL-Q150_%28fra%29-DenisdeShawi-caisse_noire.wav/LL-Q150_%28fra%29-DenisdeShawi-caisse_noire.wav.ogg"
    }
  ],
  "word": "caisse noire"
}

{
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "de",
            "2": "schwarze Kasse",
            "calque": "1",
            "unc": "1"
          },
          "expansion": "→? German: schwarze Kasse (calque)",
          "name": "desc"
        }
      ],
      "text": "→? German: schwarze Kasse (calque)"
    }
  ],
  "etymology_text": "The term dates from the first half of the 19th century, stemming from near-clandestine efforts by railway workers at improvised health insurance, for which they would pass around a black crate, to which each worker would contribute.\nSee the French Wikipedia article for more information.",
  "forms": [
    {
      "form": "caisses noires",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "caisse noire f (plural caisses noires)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "French countable nouns",
        "French entries with incorrect language header",
        "French feminine nouns",
        "French lemmas",
        "French multiword terms",
        "French nouns",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "slush fund (money stored for illegal or dishonest purposes)"
      ],
      "links": [
        [
          "slush fund",
          "slush fund"
        ]
      ],
      "tags": [
        "feminine"
      ],
      "wikipedia": [
        "fr:caisse noire"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "LL-Q150 (fra)-LoquaxFR-caisse noire.wav",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/7/7d/LL-Q150_%28fra%29-LoquaxFR-caisse_noire.wav/LL-Q150_%28fra%29-LoquaxFR-caisse_noire.wav.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/7/7d/LL-Q150_%28fra%29-LoquaxFR-caisse_noire.wav/LL-Q150_%28fra%29-LoquaxFR-caisse_noire.wav.ogg"
    },
    {
      "audio": "LL-Q150 (fra)-DenisdeShawi-caisse noire.wav",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/b/b5/LL-Q150_%28fra%29-DenisdeShawi-caisse_noire.wav/LL-Q150_%28fra%29-DenisdeShawi-caisse_noire.wav.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/b/b5/LL-Q150_%28fra%29-DenisdeShawi-caisse_noire.wav/LL-Q150_%28fra%29-DenisdeShawi-caisse_noire.wav.ogg"
    }
  ],
  "word": "caisse noire"
}