"worst-kept secret" meaning in English

{
  "forms": [
    {
      "form": "worst-kept secrets",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "worst-kept secret (plural worst-kept secrets)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "antonyms": [
        {
          "word": "best-kept secret"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2025 February 5, Peter Plisner, “East West Rail: progress from west to east”, in RAIL, number 1028, page 30:",
          "text": "Late last year, the first test train ran on the line - a Class 165 diesel multiple unit provided by Chiltern Railways. It provided yet another clear indication to what seems to be one of the worst-kept secrets on the railways - that Chiltern will be the operator of EWR services.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A situation where little or no attempt has been made to keep a matter secret."
      ],
      "id": "en-worst-kept_secret-en-noun-JePZGNUf",
      "raw_glosses": [
        "(idiomatic) A situation where little or no attempt has been made to keep a matter secret."
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "word": "worst-kept secret"
}

{
  "forms": [
    {
      "form": "worst-kept secrets",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "worst-kept secret (plural worst-kept secrets)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "antonyms": [
        {
          "word": "best-kept secret"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English idioms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "ref": "2025 February 5, Peter Plisner, “East West Rail: progress from west to east”, in RAIL, number 1028, page 30:",
          "text": "Late last year, the first test train ran on the line - a Class 165 diesel multiple unit provided by Chiltern Railways. It provided yet another clear indication to what seems to be one of the worst-kept secrets on the railways - that Chiltern will be the operator of EWR services.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A situation where little or no attempt has been made to keep a matter secret."
      ],
      "raw_glosses": [
        "(idiomatic) A situation where little or no attempt has been made to keep a matter secret."
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "word": "worst-kept secret"
}