"underreplacement" meaning in English

{
  "antonyms": [
    {
      "word": "overreplacement"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "under",
        "3": "replacement"
      },
      "expansion": "under- + replacement",
      "name": "prefix"
    }
  ],
  "etymology_text": "From under- + replacement.",
  "head_templates": [
    {
      "args": {
        "1": "!"
      },
      "expansion": "underreplacement (plural not attested)",
      "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 nouns with unattested plurals",
          "parents": [
            "Nouns with unattested plurals",
            "Nouns",
            "Lemmas"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms prefixed with under-",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Drugs",
          "orig": "en:Drugs",
          "parents": [
            "Matter",
            "Pharmacology",
            "Chemistry",
            "Nature",
            "Biochemistry",
            "Medicine",
            "Sciences",
            "All topics",
            "Biology",
            "Healthcare",
            "Fundamental",
            "Health",
            "Body"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Medicine",
          "orig": "en:Medicine",
          "parents": [
            "Biology",
            "Healthcare",
            "Sciences",
            "Health",
            "All topics",
            "Body",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Pathology",
          "orig": "en:Pathology",
          "parents": [
            "Disease",
            "Medicine",
            "Health",
            "Biology",
            "Healthcare",
            "Body",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1939, United States Department of Commerce, The Annual Report of the Secretary of Commerce, Volumes 24-29 (Volume 27), page viii:",
          "text": "In the railroad equipment industry, activity failed to recover fully as the slow process of underreplacement had not yet brought plant and equipment facilities to a level consonant with the reduced volume of railroad traffic.",
          "type": "quote"
        }
      ],
      "glosses": [
        "The replacement of a substance by a smaller amount."
      ],
      "id": "en-underreplacement-en-noun-3r~raZj7",
      "links": [
        [
          "substance",
          "substance"
        ]
      ],
      "tags": [
        "no-plural"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "LL-Q1860 (eng)-Flame, not lame-underreplacement.wav",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/b/b4/LL-Q1860_%28eng%29-Flame%2C_not_lame-underreplacement.wav/LL-Q1860_%28eng%29-Flame%2C_not_lame-underreplacement.wav.mp3",
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    },
    {
      "rhymes": "-eɪsmənt"
    }
  ],
  "word": "underreplacement"
}

{
  "antonyms": [
    {
      "word": "overreplacement"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "under",
        "3": "replacement"
      },
      "expansion": "under- + replacement",
      "name": "prefix"
    }
  ],
  "etymology_text": "From under- + replacement.",
  "head_templates": [
    {
      "args": {
        "1": "!"
      },
      "expansion": "underreplacement (plural not attested)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English nouns with unattested plurals",
        "English terms prefixed with under-",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries",
        "Rhymes:English/eɪsmənt",
        "Rhymes:English/eɪsmənt/5 syllables",
        "en:Drugs",
        "en:Medicine",
        "en:Pathology"
      ],
      "examples": [
        {
          "ref": "1939, United States Department of Commerce, The Annual Report of the Secretary of Commerce, Volumes 24-29 (Volume 27), page viii:",
          "text": "In the railroad equipment industry, activity failed to recover fully as the slow process of underreplacement had not yet brought plant and equipment facilities to a level consonant with the reduced volume of railroad traffic.",
          "type": "quote"
        }
      ],
      "glosses": [
        "The replacement of a substance by a smaller amount."
      ],
      "links": [
        [
          "substance",
          "substance"
        ]
      ],
      "tags": [
        "no-plural"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "LL-Q1860 (eng)-Flame, not lame-underreplacement.wav",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/b/b4/LL-Q1860_%28eng%29-Flame%2C_not_lame-underreplacement.wav/LL-Q1860_%28eng%29-Flame%2C_not_lame-underreplacement.wav.mp3",
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    },
    {
      "rhymes": "-eɪsmənt"
    }
  ],
  "word": "underreplacement"
}