"pigeon de passage" meaning in French

{
  "forms": [
    {
      "form": "pigeons de passage",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "pigeon de passage m (plural pigeons de passage)",
      "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"
        },
        {
          "kind": "lifeform",
          "langcode": "fr",
          "name": "Columbids",
          "orig": "fr:Columbids",
          "parents": [
            "Birds",
            "Vertebrates",
            "Chordates",
            "Animals",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1888, Comptes rendus hebdomadaires des séances de l'Académie des sciences:",
          "text": "Ce pigeon est devenu réfractaire à l’infection réiterée par le virus le plus virulent, le sang des pigeons de passage.",
          "type": "quote"
        }
      ],
      "glosses": [
        "passenger pigeon"
      ],
      "id": "en-pigeon_de_passage-fr-noun-2xKEm4x~",
      "links": [
        [
          "passenger pigeon",
          "passenger pigeon"
        ]
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "word": "pigeon de passage"
}

{
  "forms": [
    {
      "form": "pigeons de passage",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "pigeon de passage m (plural pigeons de passage)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "French countable nouns",
        "French entries with incorrect language header",
        "French lemmas",
        "French masculine nouns",
        "French multiword terms",
        "French nouns",
        "French nouns with red links in their headword lines",
        "French terms with quotations",
        "Pages with 1 entry",
        "Pages with entries",
        "Requests for translations of French quotations",
        "fr:Columbids"
      ],
      "examples": [
        {
          "ref": "1888, Comptes rendus hebdomadaires des séances de l'Académie des sciences:",
          "text": "Ce pigeon est devenu réfractaire à l’infection réiterée par le virus le plus virulent, le sang des pigeons de passage.",
          "type": "quote"
        }
      ],
      "glosses": [
        "passenger pigeon"
      ],
      "links": [
        [
          "passenger pigeon",
          "passenger pigeon"
        ]
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "word": "pigeon de passage"
}