"cast of thousands" meaning in English

{
  "etymology_text": "Originally with literal usage, although embellished even then; modern-day usage is not restricted to acting.",
  "forms": [
    {
      "form": "casts of thousands",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "casts of thousands"
      },
      "expansion": "cast of thousands (plural casts of thousands)",
      "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"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "The superheroes were a cast of thousands, each with their own unique set of powers.",
          "type": "example"
        }
      ],
      "glosses": [
        "A large number of people in one place or doing one thing."
      ],
      "id": "en-cast_of_thousands-en-noun-KRJ8Q-s7"
    }
  ],
  "word": "cast of thousands"
}

{
  "etymology_text": "Originally with literal usage, although embellished even then; modern-day usage is not restricted to acting.",
  "forms": [
    {
      "form": "casts of thousands",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "casts of thousands"
      },
      "expansion": "cast of thousands (plural casts of thousands)",
      "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",
        "English terms with usage examples",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "text": "The superheroes were a cast of thousands, each with their own unique set of powers.",
          "type": "example"
        }
      ],
      "glosses": [
        "A large number of people in one place or doing one thing."
      ]
    }
  ],
  "word": "cast of thousands"
}