"bums on seats" meaning in English

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      "expansion": "bums on seats pl (plural only)",
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  "lang_code": "en",
  "pos": "noun",
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          "ref": "2020 January 2, Graeme Pickering, “Fuelling the changes on Teeside rails”, in Rail, pages 60–61:",
          "text": "\"What's for sure is we've got to make sure people do take it up because it's only experimental and the funding for the evening service at least from Sirius Minerals is only for three years so we've got to make sure there are bums on seats within three years.\"",
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      "glosses": [
        "Alternative form of bums in seats"
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      "id": "en-bums_on_seats-en-noun-D1zFiZvC",
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  "word": "bums on seats"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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          "word": "bums in seats"
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          "ref": "2020 January 2, Graeme Pickering, “Fuelling the changes on Teeside rails”, in Rail, pages 60–61:",
          "text": "\"What's for sure is we've got to make sure people do take it up because it's only experimental and the funding for the evening service at least from Sirius Minerals is only for three years so we've got to make sure there are bums on seats within three years.\"",
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