"miners' canary" meaning in English

{
  "forms": [
    {
      "form": "miners' canaries",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "args": {
        "head": "miners' canary"
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      "expansion": "miners' canary (plural miners' canaries)",
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    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "_dis1": "0 0",
      "word": "climate canary"
    }
  ],
  "senses": [
    {
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      "glosses": [
        "A caged bird kept caged in mines because its demise provided a warning of dangerous levels of toxic gases."
      ],
      "id": "en-miners'_canary-en-noun-YXPCreSA"
    },
    {
      "categories": [],
      "glosses": [
        "Any thing, especially an organism, whose demise or distress provides an early warning of danger."
      ],
      "id": "en-miners'_canary-en-noun-OypXvLgM",
      "raw_glosses": [
        "(idiomatic) Any thing, especially an organism, whose demise or distress provides an early warning of danger."
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
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  "synonyms": [
    {
      "_dis1": "0 0",
      "word": "canary in a coal mine"
    },
    {
      "_dis1": "0 0",
      "word": "miner's canary"
    }
  ],
  "wikipedia": [
    "miner's canary"
  ],
  "word": "miners' canary"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns",
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  "forms": [
    {
      "form": "miners' canaries",
      "tags": [
        "plural"
      ]
    }
  ],
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    {
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        "head": "miners' canary"
      },
      "expansion": "miners' canary (plural miners' canaries)",
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    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "climate canary"
    }
  ],
  "senses": [
    {
      "glosses": [
        "A caged bird kept caged in mines because its demise provided a warning of dangerous levels of toxic gases."
      ]
    },
    {
      "categories": [
        "English idioms"
      ],
      "glosses": [
        "Any thing, especially an organism, whose demise or distress provides an early warning of danger."
      ],
      "raw_glosses": [
        "(idiomatic) Any thing, especially an organism, whose demise or distress provides an early warning of danger."
      ],
      "tags": [
        "idiomatic"
      ]
    }
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  "synonyms": [
    {
      "word": "canary in a coal mine"
    },
    {
      "word": "miner's canary"
    }
  ],
  "wikipedia": [
    "miner's canary"
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  "word": "miners' canary"
}