"this is where we came in" meaning in English

{
  "etymology_text": "Originally said in early movie theatres, when the custom was not to come in at a set showtime, but rather at any point during a repeating bill of short features, staying until one had viewed the whole bill up to the point that had been playing when one came in.",
  "head_templates": [
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      },
      "expansion": "this is where we came in",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
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      "examples": [
        {
          "bold_text_offsets": [
            [
              69,
              93
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          ],
          "text": "Joe hit Paul, so Paul hit Joe, so Joe hit Paul, so Paul hit Joe, and this is where we came in.",
          "type": "example"
        }
      ],
      "glosses": [
        "Said of a situation which has become repetitive."
      ],
      "id": "en-this_is_where_we_came_in-en-phrase-N3gonsPv",
      "raw_glosses": [
        "(idiomatic) Said of a situation which has become repetitive."
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-this is where we came in.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/6/6e/En-au-this_is_where_we_came_in.ogg/En-au-this_is_where_we_came_in.ogg.mp3",
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  "word": "this is where we came in"
}

{
  "etymology_text": "Originally said in early movie theatres, when the custom was not to come in at a set showtime, but rather at any point during a repeating bill of short features, staying until one had viewed the whole bill up to the point that had been playing when one came in.",
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "phrase"
      },
      "expansion": "this is where we came in",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English idioms",
        "English lemmas",
        "English multiword terms",
        "English phrases",
        "English terms with usage examples",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
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              69,
              93
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          ],
          "text": "Joe hit Paul, so Paul hit Joe, so Joe hit Paul, so Paul hit Joe, and this is where we came in.",
          "type": "example"
        }
      ],
      "glosses": [
        "Said of a situation which has become repetitive."
      ],
      "raw_glosses": [
        "(idiomatic) Said of a situation which has become repetitive."
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-this is where we came in.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/6/6e/En-au-this_is_where_we_came_in.ogg/En-au-this_is_where_we_came_in.ogg.mp3",
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  ],
  "word": "this is where we came in"
}