"common brown" meaning in English

{
  "forms": [
    {
      "form": "common browns",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "common brown (plural common browns)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Entries with translation boxes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Woiwurrung translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Butterflies",
          "orig": "en:Butterflies",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "A species of nymphalid butterfly, Heteronympha merope, endemic to Australia."
      ],
      "id": "en-common_brown-en-noun-eL1576pF",
      "links": [
        [
          "nymphalid",
          "nymphalid"
        ]
      ]
    }
  ],
  "word": "common brown"
}

{
  "forms": [
    {
      "form": "common browns",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "common brown (plural common browns)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Entries using missing taxonomic name (species)",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Requests for review of Woiwurrung translations",
        "Terms with Woiwurrung translations",
        "en:Butterflies"
      ],
      "glosses": [
        "A species of nymphalid butterfly, Heteronympha merope, endemic to Australia."
      ],
      "links": [
        [
          "nymphalid",
          "nymphalid"
        ]
      ]
    }
  ],
  "word": "common brown"
}