"unloader" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "unload",
        "3": "er"
      },
      "expansion": "unload + -er",
      "name": "suffix"
    }
  ],
  "etymology_text": "unload + -er",
  "forms": [
    {
      "form": "unloaders",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "unloader (plural unloaders)",
      "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 language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms suffixed with -er",
          "parents": [],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "self-unloader"
        }
      ],
      "examples": [
        {
          "ref": "1963 June, B. Perren, “Colvilles iron ore traffic in the Glasgow area”, in Modern Railways, page 410",
          "text": "Two ships can be accommodated on the berth, although a single-vessel discharge is the usual arrangement, and there are three 20-ton ore unloaders on the quay.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "One who or that which unloads."
      ],
      "id": "en-unloader-en-noun-45TzdJXw"
    }
  ],
  "word": "unloader"
}

{
  "derived": [
    {
      "word": "self-unloader"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "unload",
        "3": "er"
      },
      "expansion": "unload + -er",
      "name": "suffix"
    }
  ],
  "etymology_text": "unload + -er",
  "forms": [
    {
      "form": "unloaders",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "unloader (plural unloaders)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English agent nouns",
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English lemmas",
        "English nouns",
        "English terms suffixed with -er",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "1963 June, B. Perren, “Colvilles iron ore traffic in the Glasgow area”, in Modern Railways, page 410",
          "text": "Two ships can be accommodated on the berth, although a single-vessel discharge is the usual arrangement, and there are three 20-ton ore unloaders on the quay.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "One who or that which unloads."
      ]
    }
  ],
  "word": "unloader"
}