"undercooper" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "under",
        "3": "cooper"
      },
      "expansion": "under- + cooper",
      "name": "prefix"
    }
  ],
  "etymology_text": "under- + cooper",
  "forms": [
    {
      "form": "undercoopers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "undercooper (plural undercoopers)",
      "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"
        }
      ],
      "examples": [
        {
          "ref": "1899, Annual Report of the American Historical Association, page 423",
          "text": "The chief cooper saw to it that wood was supplied, the bishop's cellar master furnished the hoops, and the undercoopers kept things tight.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A subordinate cooper."
      ],
      "id": "en-undercooper-en-noun-g1RMBLyk",
      "links": [
        [
          "subordinate",
          "subordinate"
        ],
        [
          "cooper",
          "cooper"
        ]
      ]
    }
  ],
  "word": "undercooper"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "under",
        "3": "cooper"
      },
      "expansion": "under- + cooper",
      "name": "prefix"
    }
  ],
  "etymology_text": "under- + cooper",
  "forms": [
    {
      "form": "undercoopers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "undercooper (plural undercoopers)",
      "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 terms prefixed with under-",
        "English terms with quotations",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "1899, Annual Report of the American Historical Association, page 423",
          "text": "The chief cooper saw to it that wood was supplied, the bishop's cellar master furnished the hoops, and the undercoopers kept things tight.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A subordinate cooper."
      ],
      "links": [
        [
          "subordinate",
          "subordinate"
        ],
        [
          "cooper",
          "cooper"
        ]
      ]
    }
  ],
  "word": "undercooper"
}