"skouled glas" meaning in Breton

{
  "categories": [
    {
      "kind": "other",
      "name": "Formes de locutions nominales en breton",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Breton",
      "orig": "breton",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Breton",
  "lang_code": "br",
  "pos": "noun",
  "pos_title": "Forme de locution nominale",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Exemples en breton",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Oiseaux en breton",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "Claude Péridy, Ar skoul glas, Evned Breizh, Hor Yezh, 1995, page 34",
          "text": "En douaroù paour ma kresk al lann hag ar balan, eo annezet ar skouled glas.",
          "translation": "Sur les terres pauvres où poussent les genêts et les joncs vivent les busards cendrés."
        }
      ],
      "form_of": [
        {
          "word": "skoul glas"
        }
      ],
      "glosses": [
        "Pluriel de skoul glas."
      ],
      "id": "fr-skouled_glas-br-noun-8iXXYXgr",
      "topics": [
        "ornithology"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\skuletˈklɑːs\\"
    }
  ],
  "tags": [
    "form-of",
    "masculine",
    "plural"
  ],
  "word": "skouled glas"
}

{
  "categories": [
    "Formes de locutions nominales en breton",
    "breton"
  ],
  "lang": "Breton",
  "lang_code": "br",
  "pos": "noun",
  "pos_title": "Forme de locution nominale",
  "senses": [
    {
      "categories": [
        "Exemples en breton",
        "Oiseaux en breton"
      ],
      "examples": [
        {
          "ref": "Claude Péridy, Ar skoul glas, Evned Breizh, Hor Yezh, 1995, page 34",
          "text": "En douaroù paour ma kresk al lann hag ar balan, eo annezet ar skouled glas.",
          "translation": "Sur les terres pauvres où poussent les genêts et les joncs vivent les busards cendrés."
        }
      ],
      "form_of": [
        {
          "word": "skoul glas"
        }
      ],
      "glosses": [
        "Pluriel de skoul glas."
      ],
      "topics": [
        "ornithology"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\skuletˈklɑːs\\"
    }
  ],
  "tags": [
    "form-of",
    "masculine",
    "plural"
  ],
  "word": "skouled glas"
}