"underfloor" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "under",
        "3": "floor"
      },
      "expansion": "under- + floor",
      "name": "prefix"
    }
  ],
  "etymology_text": "under- + floor",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "underfloor (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "_dis": "53 47",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "50 50",
          "kind": "other",
          "name": "English terms prefixed with under-",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "derived": [
        {
          "word": "underfloor heating"
        }
      ],
      "examples": [
        {
          "ref": "2019 October 23, Pip Dunn, “The next king of Scotland”, in Rail, page 54",
          "text": "The ride quality is pure HST - you have a smoother ride than on any underfloor DMU, aided by less intrusive noise. Sitting at the end of the coaches (and thus over the bogies) is obviously that bit bouncier, but in the centre of the trailer cars it's lovely - and much better than so many new trains such as Voyagers or Class 180s... in fact, anything with those dreaded underfloor engines.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Located beneath the floor."
      ],
      "id": "en-underfloor-en-adj-0-ALej-o",
      "links": [
        [
          "beneath",
          "beneath"
        ],
        [
          "floor",
          "floor"
        ]
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "underfloor"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "under",
        "3": "floor"
      },
      "expansion": "under- + floor",
      "name": "prefix"
    }
  ],
  "etymology_text": "under- + floor",
  "forms": [
    {
      "form": "underfloors",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "underfloor (plural underfloors)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "53 47",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "50 50",
          "kind": "other",
          "name": "English terms prefixed with under-",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "A layer of flooring beneath the main floor surface."
      ],
      "id": "en-underfloor-en-noun-6ttO8LND",
      "links": [
        [
          "layer",
          "layer"
        ],
        [
          "flooring",
          "flooring"
        ]
      ],
      "synonyms": [
        {
          "word": "subfloor"
        }
      ]
    }
  ],
  "word": "underfloor"
}

{
  "categories": [
    "English adjectives",
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English nouns",
    "English terms prefixed with under-",
    "English uncomparable adjectives"
  ],
  "derived": [
    {
      "word": "underfloor heating"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "under",
        "3": "floor"
      },
      "expansion": "under- + floor",
      "name": "prefix"
    }
  ],
  "etymology_text": "under- + floor",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "underfloor (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "2019 October 23, Pip Dunn, “The next king of Scotland”, in Rail, page 54",
          "text": "The ride quality is pure HST - you have a smoother ride than on any underfloor DMU, aided by less intrusive noise. Sitting at the end of the coaches (and thus over the bogies) is obviously that bit bouncier, but in the centre of the trailer cars it's lovely - and much better than so many new trains such as Voyagers or Class 180s... in fact, anything with those dreaded underfloor engines.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Located beneath the floor."
      ],
      "links": [
        [
          "beneath",
          "beneath"
        ],
        [
          "floor",
          "floor"
        ]
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "underfloor"
}

{
  "categories": [
    "English adjectives",
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English nouns",
    "English terms prefixed with under-",
    "English uncomparable adjectives"
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "under",
        "3": "floor"
      },
      "expansion": "under- + floor",
      "name": "prefix"
    }
  ],
  "etymology_text": "under- + floor",
  "forms": [
    {
      "form": "underfloors",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "underfloor (plural underfloors)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "A layer of flooring beneath the main floor surface."
      ],
      "links": [
        [
          "layer",
          "layer"
        ],
        [
          "flooring",
          "flooring"
        ]
      ]
    }
  ],
  "synonyms": [
    {
      "word": "subfloor"
    }
  ],
  "word": "underfloor"
}