"underextraction" meaning in English

{
  "antonyms": [
    {
      "word": "overextraction"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "under",
        "3": "extraction"
      },
      "expansion": "under- + extraction",
      "name": "prefix"
    }
  ],
  "etymology_text": "under- + extraction",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "underextraction (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 terms prefixed with under-",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Less than the normal or optimum amount of extraction"
      ],
      "id": "en-underextraction-en-noun-Yyr~cL42",
      "links": [
        [
          "extraction",
          "extraction"
        ]
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "word": "underextraction"
}

{
  "antonyms": [
    {
      "word": "overextraction"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "under",
        "3": "extraction"
      },
      "expansion": "under- + extraction",
      "name": "prefix"
    }
  ],
  "etymology_text": "under- + extraction",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "underextraction (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms prefixed with under-",
        "English uncountable nouns"
      ],
      "glosses": [
        "Less than the normal or optimum amount of extraction"
      ],
      "links": [
        [
          "extraction",
          "extraction"
        ]
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "word": "underextraction"
}