"blue swallow" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "blue",
        "3": "swallow"
      },
      "expansion": "blue + swallow",
      "name": "com"
    }
  ],
  "etymology_text": "blue + swallow",
  "forms": [
    {
      "form": "blue swallows",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "blue swallow (plural blue swallows)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Swallows",
          "orig": "en:Swallows",
          "parents": [
            "Perching birds",
            "Birds",
            "Vertebrates",
            "Chordates",
            "Animals",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Hirundo atrocaerulea, a species of swallow."
      ],
      "id": "en-blue_swallow-en-noun-YqzXT3Po",
      "links": [
        [
          "swallow",
          "swallow"
        ]
      ],
      "translations": [
        {
          "code": "af",
          "lang": "Afrikaans",
          "sense": "Translations",
          "word": "blouswael"
        },
        {
          "code": "bg",
          "lang": "Bulgarian",
          "roman": "sinjata ljastovica",
          "sense": "Translations",
          "word": "синята лястовица"
        },
        {
          "code": "ca",
          "lang": "Catalan",
          "sense": "Translations",
          "word": "oreneta blava"
        },
        {
          "code": "nl",
          "lang": "Dutch",
          "sense": "Translations",
          "word": "blauwe zwaluw"
        },
        {
          "code": "fr",
          "lang": "French",
          "sense": "Translations",
          "word": "hirondelle bleue"
        },
        {
          "code": "es",
          "lang": "Spanish",
          "sense": "Translations",
          "word": "golondrina azul"
        },
        {
          "code": "sv",
          "lang": "Swedish",
          "sense": "Translations",
          "word": "blåsvala"
        }
      ]
    }
  ],
  "word": "blue swallow"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "blue",
        "3": "swallow"
      },
      "expansion": "blue + swallow",
      "name": "com"
    }
  ],
  "etymology_text": "blue + swallow",
  "forms": [
    {
      "form": "blue swallows",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "blue swallow (plural blue swallows)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English compound terms",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Entries using missing taxonomic name (species)",
        "Translation table header lacks gloss",
        "en:Swallows"
      ],
      "glosses": [
        "Hirundo atrocaerulea, a species of swallow."
      ],
      "links": [
        [
          "swallow",
          "swallow"
        ]
      ]
    }
  ],
  "translations": [
    {
      "code": "af",
      "lang": "Afrikaans",
      "sense": "Translations",
      "word": "blouswael"
    },
    {
      "code": "bg",
      "lang": "Bulgarian",
      "roman": "sinjata ljastovica",
      "sense": "Translations",
      "word": "синята лястовица"
    },
    {
      "code": "ca",
      "lang": "Catalan",
      "sense": "Translations",
      "word": "oreneta blava"
    },
    {
      "code": "nl",
      "lang": "Dutch",
      "sense": "Translations",
      "word": "blauwe zwaluw"
    },
    {
      "code": "fr",
      "lang": "French",
      "sense": "Translations",
      "word": "hirondelle bleue"
    },
    {
      "code": "es",
      "lang": "Spanish",
      "sense": "Translations",
      "word": "golondrina azul"
    },
    {
      "code": "sv",
      "lang": "Swedish",
      "sense": "Translations",
      "word": "blåsvala"
    }
  ],
  "word": "blue swallow"
}