"ship fever" meaning in English

{
  "etymology_text": "It was once common in the crowded conditions on ships.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "ship fever (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Bacterial diseases",
          "orig": "en:Bacterial diseases",
          "parents": [
            "Diseases",
            "Disease",
            "Health",
            "Pathology",
            "Body",
            "Medicine",
            "Human",
            "Biology",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Vector-borne diseases",
          "orig": "en:Vector-borne diseases",
          "parents": [
            "Diseases",
            "Disease",
            "Health",
            "Pathology",
            "Body",
            "Medicine",
            "Human",
            "Biology",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A form of typhus fever."
      ],
      "id": "en-ship_fever-en-noun-W72lVvcz",
      "links": [
        [
          "typhus",
          "typhus"
        ],
        [
          "fever",
          "fever"
        ]
      ],
      "synonyms": [
        {
          "word": "hospital fever"
        },
        {
          "word": "jail fever"
        },
        {
          "word": "putrid fever"
        },
        {
          "word": "ship-fever"
        }
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "word": "ship fever"
}

{
  "etymology_text": "It was once common in the crowded conditions on ships.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "ship fever (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys",
        "English uncountable nouns",
        "en:Bacterial diseases",
        "en:Vector-borne diseases"
      ],
      "glosses": [
        "A form of typhus fever."
      ],
      "links": [
        [
          "typhus",
          "typhus"
        ],
        [
          "fever",
          "fever"
        ]
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "hospital fever"
    },
    {
      "word": "jail fever"
    },
    {
      "word": "putrid fever"
    },
    {
      "word": "ship-fever"
    }
  ],
  "word": "ship fever"
}