"sunny-day flooding" meaning in English

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      "expansion": "sunny-day flooding (uncountable)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "ref": "2020 April, Elizabeth Kolbert, “Why we won't avoid a climate catastrophehttps://www.nationalgeographic.com/magazine/2020/04/why-we-wont-avoid-a-climate-catastrophe-feature/”, in National Geographic:",
          "text": "Increasingly, low-lying coastal cities in the United States are experiencing what’s known as sunny-day flooding, when all it takes is a high tide to send water gushing into the streets.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Flooding that is caused by something other than rain, such as a tidal wave or the failure of a dam."
      ],
      "id": "en-sunny-day_flooding-en-noun-HR1e3fkR",
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        [
          "Flooding",
          "flood"
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          "rain",
          "rain"
        ],
        [
          "tidal wave",
          "tidal wave"
        ],
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          "dam",
          "dam"
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      "tags": [
        "uncountable"
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  "word": "sunny-day flooding"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "text": "Increasingly, low-lying coastal cities in the United States are experiencing what’s known as sunny-day flooding, when all it takes is a high tide to send water gushing into the streets.",
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      ],
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        "Flooding that is caused by something other than rain, such as a tidal wave or the failure of a dam."
      ],
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        [
          "Flooding",
          "flood"
        ],
        [
          "rain",
          "rain"
        ],
        [
          "tidal wave",
          "tidal wave"
        ],
        [
          "dam",
          "dam"
        ]
      ],
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        "uncountable"
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  "word": "sunny-day flooding"
}