"until hell freezes over" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prepositional phrase",
        "head": ""
      },
      "expansion": "until hell freezes over",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "until hell freezes over",
      "name": "en-PP"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prep_phrase",
  "senses": [
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          "kind": "other",
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      "examples": [
        {
          "text": "He can continue to be hard on himself until hell freezes over, because he's so self-centeredly pessimistic that there's nothing I can ever do to lighten him up.",
          "type": "example"
        },
        {
          "text": "They can be bellyaching to me about their life's problems until hell freezes over, but it doesn't mean that they'll ever get my sympathy.",
          "type": "example"
        },
        {
          "text": "I am prepared to wait for my answer until hell freezes over.",
          "type": "example"
        }
      ],
      "glosses": [
        "forever; without success, no matter how long one perseveres."
      ],
      "id": "en-until_hell_freezes_over-en-prep_phrase-xqYRoLjx",
      "links": [
        [
          "forever",
          "forever"
        ],
        [
          "success",
          "success"
        ],
        [
          "persevere",
          "persevere"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) forever; without success, no matter how long one perseveres."
      ],
      "related": [
        {
          "word": "when Hell freezes over"
        }
      ],
      "synonyms": [
        {
          "word": "until the cows come home"
        }
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-until hell freezes over.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/c/c9/En-au-until_hell_freezes_over.ogg/En-au-until_hell_freezes_over.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/c/c9/En-au-until_hell_freezes_over.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "until hell freezes over"
}

{
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prepositional phrase",
        "head": ""
      },
      "expansion": "until hell freezes over",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "until hell freezes over",
      "name": "en-PP"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prep_phrase",
  "related": [
    {
      "word": "when Hell freezes over"
    }
  ],
  "senses": [
    {
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      "examples": [
        {
          "text": "He can continue to be hard on himself until hell freezes over, because he's so self-centeredly pessimistic that there's nothing I can ever do to lighten him up.",
          "type": "example"
        },
        {
          "text": "They can be bellyaching to me about their life's problems until hell freezes over, but it doesn't mean that they'll ever get my sympathy.",
          "type": "example"
        },
        {
          "text": "I am prepared to wait for my answer until hell freezes over.",
          "type": "example"
        }
      ],
      "glosses": [
        "forever; without success, no matter how long one perseveres."
      ],
      "links": [
        [
          "forever",
          "forever"
        ],
        [
          "success",
          "success"
        ],
        [
          "persevere",
          "persevere"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) forever; without success, no matter how long one perseveres."
      ],
      "tags": [
        "idiomatic"
      ]
    }
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  "sounds": [
    {
      "audio": "En-au-until hell freezes over.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/c/c9/En-au-until_hell_freezes_over.ogg/En-au-until_hell_freezes_over.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/c/c9/En-au-until_hell_freezes_over.ogg",
      "tags": [
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      "text": "Audio (AU)"
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  ],
  "synonyms": [
    {
      "word": "until the cows come home"
    }
  ],
  "word": "until hell freezes over"
}