"October surprise" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "October",
        "3": "surprise"
      },
      "expansion": "October + surprise",
      "name": "compound"
    }
  ],
  "etymology_text": "October + surprise from the surprise news occurring during October",
  "forms": [
    {
      "form": "October surprises",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "October surprise (plural October surprises)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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          "source": "w"
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        {
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          "langcode": "en",
          "name": "US politics",
          "orig": "en:US politics",
          "parents": [
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          "source": "w"
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      ],
      "glosses": [
        "An occurrence that unexpectedly comes to public attention just prior to a November election, especially a presidential election, and that is likely to affect the outcome."
      ],
      "id": "en-October_surprise-en-noun-jKn3BMT2",
      "links": [
        [
          "occurrence",
          "occurrence"
        ],
        [
          "unexpected",
          "unexpected"
        ],
        [
          "election",
          "election"
        ],
        [
          "presidential",
          "presidential"
        ]
      ],
      "raw_glosses": [
        "(US politics) An occurrence that unexpectedly comes to public attention just prior to a November election, especially a presidential election, and that is likely to affect the outcome."
      ],
      "tags": [
        "US"
      ],
      "topics": [
        "government",
        "politics"
      ],
      "wikipedia": [
        "October surprise"
      ]
    }
  ],
  "word": "October surprise"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "October",
        "3": "surprise"
      },
      "expansion": "October + surprise",
      "name": "compound"
    }
  ],
  "etymology_text": "October + surprise from the surprise news occurring during October",
  "forms": [
    {
      "form": "October surprises",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "October surprise (plural October surprises)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        "English compound terms",
        "English countable nouns",
        "English entries with incorrect language header",
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      ],
      "glosses": [
        "An occurrence that unexpectedly comes to public attention just prior to a November election, especially a presidential election, and that is likely to affect the outcome."
      ],
      "links": [
        [
          "occurrence",
          "occurrence"
        ],
        [
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        [
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        ],
        [
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          "presidential"
        ]
      ],
      "raw_glosses": [
        "(US politics) An occurrence that unexpectedly comes to public attention just prior to a November election, especially a presidential election, and that is likely to affect the outcome."
      ],
      "tags": [
        "US"
      ],
      "topics": [
        "government",
        "politics"
      ],
      "wikipedia": [
        "October surprise"
      ]
    }
  ],
  "word": "October surprise"
}