"Emerald Isle" meaning in English

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      "form": "the Emerald Isle",
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  "lang": "English",
  "lang_code": "en",
  "pos": "name",
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          "name": "Ireland",
          "orig": "en:Ireland",
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            [
              77,
              89
            ]
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          "ref": "1795, William Drennan, Erin iii:",
          "text": "Nor one feeling of vengeance presume to defile\nThe cause, or the men, of the Emerald Isle.",
          "type": "quotation"
        },
        {
          "bold_text_offsets": [
            [
              106,
              119
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          "ref": "1932, Amelia Earhart, “Across the Atlantic with the Friendship”, in The Fun of It, page 78:",
          "text": "[…] with our diminishing supply of gasoline, our situation might be serious. Minutes passed and we saw no Emer­ald Isle.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A nickname for Ireland."
      ],
      "id": "en-Emerald_Isle-en-name-nv6FFUAS",
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        [
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      ],
      "synonyms": [
        {
          "word": "Green Isle"
        }
      ]
    }
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      "tags": [
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  "word": "Emerald Isle"
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  "forms": [
    {
      "form": "the Emerald Isle",
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    }
  ],
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  "lang_code": "en",
  "pos": "name",
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          "ref": "1795, William Drennan, Erin iii:",
          "text": "Nor one feeling of vengeance presume to defile\nThe cause, or the men, of the Emerald Isle.",
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        {
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              106,
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          "ref": "1932, Amelia Earhart, “Across the Atlantic with the Friendship”, in The Fun of It, page 78:",
          "text": "[…] with our diminishing supply of gasoline, our situation might be serious. Minutes passed and we saw no Emer­ald Isle.",
          "type": "quotation"
        }
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        "A nickname for Ireland."
      ],
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        ]
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      "synonyms": [
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