"swartback" meaning in English

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  "etymology_text": "From swart + back.",
  "forms": [
    {
      "form": "swartbacks",
      "tags": [
        "plural"
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  "lang_code": "en",
  "pos": "noun",
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          "kind": "lifeform",
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          "text": "Thy foot had been on the Maiden-skerrie of Northmaven, known before but to the webbed sole of the swartback.",
          "type": "quote"
        }
      ],
      "glosses": [
        "The great black-backed gull (Larus marinus)."
      ],
      "id": "en-swartback-en-noun-EGSWKOsb",
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        "(obsolete, Scotland) The great black-backed gull (Larus marinus)."
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  "word": "swartback"
}

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    {
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        "2": "swart",
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      "expansion": "swart + back",
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  ],
  "etymology_text": "From swart + back.",
  "forms": [
    {
      "form": "swartbacks",
      "tags": [
        "plural"
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  ],
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          "text": "Thy foot had been on the Maiden-skerrie of Northmaven, known before but to the webbed sole of the swartback.",
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        }
      ],
      "glosses": [
        "The great black-backed gull (Larus marinus)."
      ],
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        "(obsolete, Scotland) The great black-backed gull (Larus marinus)."
      ],
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  "word": "swartback"
}