"swing vote" meaning in English

{
  "forms": [
    {
      "form": "swing votes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "swing vote (plural swing votes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with redundant script codes",
          "parents": [
            "Terms with redundant script codes",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A vote held by a swing voter, and as such unpredictable."
      ],
      "id": "en-swing_vote-en-noun-41FNhVYT",
      "links": [
        [
          "swing voter",
          "swing voter"
        ],
        [
          "unpredictable",
          "unpredictable"
        ]
      ],
      "synonyms": [
        {
          "word": "floating vote"
        }
      ],
      "translations": [
        {
          "code": "he",
          "lang": "Hebrew",
          "roman": "kol tsaf",
          "sense": "vote held by a swing voter, and as such it is an unpredictable vote",
          "word": "קול צף"
        },
        {
          "code": "ja",
          "lang": "Japanese",
          "roman": "fudōhyō",
          "sense": "vote held by a swing voter, and as such it is an unpredictable vote",
          "word": "浮動票"
        }
      ]
    }
  ],
  "word": "swing vote"
}

{
  "forms": [
    {
      "form": "swing votes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "swing vote (plural swing votes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Japanese terms with redundant script codes"
      ],
      "glosses": [
        "A vote held by a swing voter, and as such unpredictable."
      ],
      "links": [
        [
          "swing voter",
          "swing voter"
        ],
        [
          "unpredictable",
          "unpredictable"
        ]
      ]
    }
  ],
  "synonyms": [
    {
      "word": "floating vote"
    }
  ],
  "translations": [
    {
      "code": "he",
      "lang": "Hebrew",
      "roman": "kol tsaf",
      "sense": "vote held by a swing voter, and as such it is an unpredictable vote",
      "word": "קול צף"
    },
    {
      "code": "ja",
      "lang": "Japanese",
      "roman": "fudōhyō",
      "sense": "vote held by a swing voter, and as such it is an unpredictable vote",
      "word": "浮動票"
    }
  ],
  "word": "swing vote"
}