"canary girl" meaning in English

{
  "etymology_text": "Exposure to toxic TNT could turn the skin an orange-yellow colour reminiscent of the plumage of a canary.",
  "forms": [
    {
      "form": "canary girls",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "canary girl (plural canary girls)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "British English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A female worker making TNT shells during World War I."
      ],
      "id": "en-canary_girl-en-noun-QMN5i82Z",
      "links": [
        [
          "female",
          "female"
        ],
        [
          "worker",
          "worker"
        ],
        [
          "TNT",
          "TNT"
        ],
        [
          "shell",
          "shell"
        ]
      ],
      "raw_glosses": [
        "(UK) A female worker making TNT shells during World War I."
      ],
      "tags": [
        "UK"
      ],
      "wikipedia": [
        "canary girl"
      ]
    }
  ],
  "word": "canary girl"
}

{
  "etymology_text": "Exposure to toxic TNT could turn the skin an orange-yellow colour reminiscent of the plumage of a canary.",
  "forms": [
    {
      "form": "canary girls",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "canary girl (plural canary girls)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "British English",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns"
      ],
      "glosses": [
        "A female worker making TNT shells during World War I."
      ],
      "links": [
        [
          "female",
          "female"
        ],
        [
          "worker",
          "worker"
        ],
        [
          "TNT",
          "TNT"
        ],
        [
          "shell",
          "shell"
        ]
      ],
      "raw_glosses": [
        "(UK) A female worker making TNT shells during World War I."
      ],
      "tags": [
        "UK"
      ],
      "wikipedia": [
        "canary girl"
      ]
    }
  ],
  "word": "canary girl"
}