"tunnel rat" meaning in English

{
  "forms": [
    {
      "form": "tunnel rats",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "tunnel rat (plural tunnel rats)",
      "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 topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Vietnam War",
          "orig": "en:Vietnam War",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2006, Douglas Bey, Wizard 6: A Combat Psychiatrist in Vietnam, Texas A & M University Press",
          "text": "He had been serving as a tunnel rat with the 1st Engineer Battalion's team of “Diehard Tunnel Rats.” This group was based in Lai Khe and flew by helicopter to tunnel sites within the division's area of operations.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A soldier trained to enter enclosed enemy spaces like tunnel systems to search them and eliminate and/or capture any occupants."
      ],
      "id": "en-tunnel_rat-en-noun-RIg8Xl7s",
      "links": [
        [
          "soldier",
          "soldier"
        ]
      ],
      "raw_glosses": [
        "(informal) A soldier trained to enter enclosed enemy spaces like tunnel systems to search them and eliminate and/or capture any occupants."
      ],
      "tags": [
        "informal"
      ],
      "wikipedia": [
        "tunnel rat"
      ]
    }
  ],
  "word": "tunnel rat"
}

{
  "forms": [
    {
      "form": "tunnel rats",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "tunnel rat (plural tunnel rats)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English informal terms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys",
        "English terms with quotations",
        "en:Vietnam War"
      ],
      "examples": [
        {
          "ref": "2006, Douglas Bey, Wizard 6: A Combat Psychiatrist in Vietnam, Texas A & M University Press",
          "text": "He had been serving as a tunnel rat with the 1st Engineer Battalion's team of “Diehard Tunnel Rats.” This group was based in Lai Khe and flew by helicopter to tunnel sites within the division's area of operations.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A soldier trained to enter enclosed enemy spaces like tunnel systems to search them and eliminate and/or capture any occupants."
      ],
      "links": [
        [
          "soldier",
          "soldier"
        ]
      ],
      "raw_glosses": [
        "(informal) A soldier trained to enter enclosed enemy spaces like tunnel systems to search them and eliminate and/or capture any occupants."
      ],
      "tags": [
        "informal"
      ],
      "wikipedia": [
        "tunnel rat"
      ]
    }
  ],
  "word": "tunnel rat"
}