"underpressurised" meaning in English

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        "simple past and past participle of underpressurise"
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  "word": "underpressurised"
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  "forms": [
    {
      "form": "more underpressurised",
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    {
      "form": "most underpressurised",
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  "pos": "adj",
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        {
          "ref": "2015 September 8, Graham Snowdon, “Iceland in meltdown after reaching Euro 2016”, in The Guardian:",
          "text": "Deflategate – the biggest scandal involving underpressurised balls ever to engulf American football – parped its way ever more painfully towards a denouement last week.",
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  "word": "underpressurised"
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      "form": "more underpressurised",
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      "form": "most underpressurised",
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