"on a bell" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prepositional phrase",
        "head": ""
      },
      "expansion": "on a bell",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "on a bell",
      "name": "en-PP"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prep_phrase",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Film",
          "orig": "en:Film",
          "parents": [
            "Entertainment",
            "Mass media",
            "Culture",
            "Media",
            "Society",
            "Communication",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1970, Michael Pate, The Film Actor: Acting for Motion Pictures and Television, page 30",
          "text": "[…] and putting the set \"on a bell,\" the First Assistant Director will call \"Roll 'em!\"",
          "type": "quotation"
        },
        {
          "ref": "2013, Bethany Rooney, Mary Lou Belli, Directors Tell the Story, page 184",
          "text": "When the beauty team departs the set, the AD will say, “Let's go on a bell.” A bell sounds throughout the stage, and […]",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Warned by the ringing of a bell to remain silent during a period of shooting."
      ],
      "id": "en-on_a_bell-en-prep_phrase-7AEQEoiN",
      "links": [
        [
          "film",
          "film#Noun"
        ],
        [
          "bell",
          "bell"
        ],
        [
          "silent",
          "silent"
        ],
        [
          "shoot",
          "shoot"
        ]
      ],
      "raw_glosses": [
        "(film) Warned by the ringing of a bell to remain silent during a period of shooting."
      ],
      "topics": [
        "broadcasting",
        "film",
        "media",
        "television"
      ]
    }
  ],
  "word": "on a bell"
}

{
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prepositional phrase",
        "head": ""
      },
      "expansion": "on a bell",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "on a bell",
      "name": "en-PP"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prep_phrase",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English prepositional phrases",
        "English terms with quotations",
        "Quotation templates to be cleaned",
        "en:Film"
      ],
      "examples": [
        {
          "ref": "1970, Michael Pate, The Film Actor: Acting for Motion Pictures and Television, page 30",
          "text": "[…] and putting the set \"on a bell,\" the First Assistant Director will call \"Roll 'em!\"",
          "type": "quotation"
        },
        {
          "ref": "2013, Bethany Rooney, Mary Lou Belli, Directors Tell the Story, page 184",
          "text": "When the beauty team departs the set, the AD will say, “Let's go on a bell.” A bell sounds throughout the stage, and […]",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Warned by the ringing of a bell to remain silent during a period of shooting."
      ],
      "links": [
        [
          "film",
          "film#Noun"
        ],
        [
          "bell",
          "bell"
        ],
        [
          "silent",
          "silent"
        ],
        [
          "shoot",
          "shoot"
        ]
      ],
      "raw_glosses": [
        "(film) Warned by the ringing of a bell to remain silent during a period of shooting."
      ],
      "topics": [
        "broadcasting",
        "film",
        "media",
        "television"
      ]
    }
  ],
  "word": "on a bell"
}