"bad sign" meaning in English

{
  "forms": [
    {
      "form": "bad signs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "bad sign (plural bad signs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [],
      "examples": [
        {
          "text": "Nobody was home when I arrived, which was a bad sign.",
          "type": "example"
        }
      ],
      "glosses": [
        "An action or thing that suggests something is wrong."
      ],
      "id": "en-bad_sign-en-noun-ISDjuByQ"
    },
    {
      "categories": [
        {
          "_dis": "39 61",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "39 61",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "39 61",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "text": "She was born under a bad sign.",
          "type": "example"
        }
      ],
      "glosses": [
        "An unlucky star sign."
      ],
      "id": "en-bad_sign-en-noun-UsOmDx0R",
      "links": [
        [
          "star sign",
          "star sign"
        ]
      ]
    }
  ],
  "word": "bad sign"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns",
    "Pages with 1 entry",
    "Pages with entries"
  ],
  "forms": [
    {
      "form": "bad signs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "bad sign (plural bad signs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English terms with usage examples"
      ],
      "examples": [
        {
          "text": "Nobody was home when I arrived, which was a bad sign.",
          "type": "example"
        }
      ],
      "glosses": [
        "An action or thing that suggests something is wrong."
      ]
    },
    {
      "categories": [
        "English terms with usage examples"
      ],
      "examples": [
        {
          "text": "She was born under a bad sign.",
          "type": "example"
        }
      ],
      "glosses": [
        "An unlucky star sign."
      ],
      "links": [
        [
          "star sign",
          "star sign"
        ]
      ]
    }
  ],
  "word": "bad sign"
}