"all bets are off" meaning in English

{
  "etymology_text": "Originally used by sports bookmakers, and in particular horseracing. The bookmaker is not taking any more bets and all existing bets placed on the competition are now null and void. This may have been because the race was cancelled, the starting lineup was substantially changed, or due to an irregularity in the conduct of the race.",
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "phrase",
        "head": "all bets are off"
      },
      "expansion": "all bets are off",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        {
          "_dis": "69 31",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "Indicates that a future event appears uncertain, especially one that before seemed more certain. Any prior agreements are no longer valid."
      ],
      "id": "en-all_bets_are_off-en-phrase-vVhKG-b4",
      "raw_glosses": [
        "(idiomatic) Indicates that a future event appears uncertain, especially one that before seemed more certain. Any prior agreements are no longer valid."
      ],
      "tags": [
        "idiomatic"
      ]
    },
    {
      "categories": [],
      "glosses": [
        "Anything can happen; any previous preconceptions about what might happen are dismissed."
      ],
      "id": "en-all_bets_are_off-en-phrase-EVcvWW3v",
      "raw_glosses": [
        "(idiomatic, by extension) Anything can happen; any previous preconceptions about what might happen are dismissed."
      ],
      "tags": [
        "broadly",
        "idiomatic"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-au-all bets are off.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/5/52/En-au-all_bets_are_off.ogg/En-au-all_bets_are_off.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/5/52/En-au-all_bets_are_off.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "all bets are off"
}

{
  "categories": [
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English phrases",
    "English terms with audio links"
  ],
  "etymology_text": "Originally used by sports bookmakers, and in particular horseracing. The bookmaker is not taking any more bets and all existing bets placed on the competition are now null and void. This may have been because the race was cancelled, the starting lineup was substantially changed, or due to an irregularity in the conduct of the race.",
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "phrase",
        "head": "all bets are off"
      },
      "expansion": "all bets are off",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        "English idioms"
      ],
      "glosses": [
        "Indicates that a future event appears uncertain, especially one that before seemed more certain. Any prior agreements are no longer valid."
      ],
      "raw_glosses": [
        "(idiomatic) Indicates that a future event appears uncertain, especially one that before seemed more certain. Any prior agreements are no longer valid."
      ],
      "tags": [
        "idiomatic"
      ]
    },
    {
      "categories": [
        "English idioms"
      ],
      "glosses": [
        "Anything can happen; any previous preconceptions about what might happen are dismissed."
      ],
      "raw_glosses": [
        "(idiomatic, by extension) Anything can happen; any previous preconceptions about what might happen are dismissed."
      ],
      "tags": [
        "broadly",
        "idiomatic"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-au-all bets are off.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/5/52/En-au-all_bets_are_off.ogg/En-au-all_bets_are_off.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/5/52/En-au-all_bets_are_off.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "all bets are off"
}