"dying breed" meaning in English

{
  "forms": [
    {
      "form": "dying breeds",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "dying breed (plural dying breeds)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "Book lovers are a dying breed; now people just watch online videos.",
          "type": "example"
        }
      ],
      "glosses": [
        "A group of people or things that is becoming less numerous over time."
      ],
      "id": "en-dying_breed-en-noun-zmDrOqnt",
      "links": [
        [
          "numerous",
          "numerous"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) A group of people or things that is becoming less numerous over time."
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "word": "dying breed"
}

{
  "forms": [
    {
      "form": "dying breeds",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "dying breed (plural dying breeds)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English idioms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with usage examples"
      ],
      "examples": [
        {
          "text": "Book lovers are a dying breed; now people just watch online videos.",
          "type": "example"
        }
      ],
      "glosses": [
        "A group of people or things that is becoming less numerous over time."
      ],
      "links": [
        [
          "numerous",
          "numerous"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) A group of people or things that is becoming less numerous over time."
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "word": "dying breed"
}