"three-spined stickleback" meaning in English

{
  "forms": [
    {
      "form": "three-spined sticklebacks",
      "tags": [
        "plural"
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      "expansion": "three-spined stickleback (plural three-spined sticklebacks)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
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        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Gasterosteiform fish",
          "orig": "en:Gasterosteiform fish",
          "parents": [
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        }
      ],
      "glosses": [
        "Gasterosteus aculeatus, a small fish of coastal and inland waters of the Northern Hemisphere, that can make its spines erect when threatened, which makes it hard to swallow."
      ],
      "id": "en-three-spined_stickleback-en-noun-OFiq4qXG",
      "links": [
        [
          "Gasterosteus aculeatus",
          "Gasterosteus aculeatus#Translingual"
        ]
      ],
      "synonyms": [
        {
          "word": "three-spine stickleback"
        }
      ]
    }
  ],
  "word": "three-spined stickleback"
}

{
  "forms": [
    {
      "form": "three-spined sticklebacks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "three-spined stickleback (plural three-spined sticklebacks)",
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  "lang_code": "en",
  "pos": "noun",
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        "en:Gasterosteiform fish"
      ],
      "glosses": [
        "Gasterosteus aculeatus, a small fish of coastal and inland waters of the Northern Hemisphere, that can make its spines erect when threatened, which makes it hard to swallow."
      ],
      "links": [
        [
          "Gasterosteus aculeatus",
          "Gasterosteus aculeatus#Translingual"
        ]
      ]
    }
  ],
  "synonyms": [
    {
      "word": "three-spine stickleback"
    }
  ],
  "word": "three-spined stickleback"
}