"bathtub curve" meaning in English

{
  "etymology_text": "From its shape.",
  "forms": [
    {
      "form": "bathtub curves",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "bathtub curve (plural bathtub curves)",
      "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"
        }
      ],
      "glosses": [
        "A curve used in reliability engineering, describing a particular form of the hazard function taking into account three categories of failure rate."
      ],
      "id": "en-bathtub_curve-en-noun-mJjqA9~Y",
      "links": [
        [
          "curve",
          "curve"
        ],
        [
          "reliability",
          "reliability"
        ],
        [
          "engineering",
          "engineering"
        ],
        [
          "hazard function",
          "hazard function"
        ],
        [
          "failure rate",
          "failure rate"
        ]
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "curve",
          "word": "kylpyammekäyrä"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "curve",
          "word": "ammekäyrä"
        },
        {
          "code": "sv",
          "lang": "Swedish",
          "sense": "curve",
          "tags": [
            "common-gender"
          ],
          "word": "badkarskurva"
        }
      ],
      "wikipedia": [
        "bathtub curve"
      ]
    }
  ],
  "word": "bathtub curve"
}

{
  "etymology_text": "From its shape.",
  "forms": [
    {
      "form": "bathtub curves",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "bathtub curve (plural bathtub curves)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns"
      ],
      "glosses": [
        "A curve used in reliability engineering, describing a particular form of the hazard function taking into account three categories of failure rate."
      ],
      "links": [
        [
          "curve",
          "curve"
        ],
        [
          "reliability",
          "reliability"
        ],
        [
          "engineering",
          "engineering"
        ],
        [
          "hazard function",
          "hazard function"
        ],
        [
          "failure rate",
          "failure rate"
        ]
      ],
      "wikipedia": [
        "bathtub curve"
      ]
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "curve",
      "word": "kylpyammekäyrä"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "curve",
      "word": "ammekäyrä"
    },
    {
      "code": "sv",
      "lang": "Swedish",
      "sense": "curve",
      "tags": [
        "common-gender"
      ],
      "word": "badkarskurva"
    }
  ],
  "word": "bathtub curve"
}