"down tube" meaning in English

{
  "forms": [
    {
      "form": "down tubes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "down tube (plural down tubes)",
      "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": "Entries with translation boxes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Finnish translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Hungarian translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Bicycle parts",
          "orig": "en:Bicycle parts",
          "parents": [
            "Cycling",
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Cycling",
          "orig": "en:Cycling",
          "parents": [
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A tube in the bicycle frame that connects the bottom bracket shell to the head tube."
      ],
      "id": "en-down_tube-en-noun-WPdZ~mhU",
      "links": [
        [
          "cycling",
          "cycling#Noun"
        ],
        [
          "bicycle",
          "bicycle"
        ],
        [
          "frame",
          "frame"
        ],
        [
          "bottom bracket",
          "bottom bracket"
        ],
        [
          "head tube",
          "head tube"
        ]
      ],
      "raw_glosses": [
        "(cycling) A tube in the bicycle frame that connects the bottom bracket shell to the head tube."
      ],
      "synonyms": [
        {
          "word": "downtube"
        }
      ],
      "topics": [
        "cycling",
        "hobbies",
        "lifestyle",
        "sports"
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "part of bicycle frame",
          "word": "alaputki"
        },
        {
          "code": "hu",
          "lang": "Hungarian",
          "sense": "part of bicycle frame",
          "word": "alsó cső"
        }
      ]
    }
  ],
  "word": "down tube"
}

{
  "forms": [
    {
      "form": "down tubes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "down tube (plural down tubes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with Finnish translations",
        "Terms with Hungarian translations",
        "en:Bicycle parts",
        "en:Cycling"
      ],
      "glosses": [
        "A tube in the bicycle frame that connects the bottom bracket shell to the head tube."
      ],
      "links": [
        [
          "cycling",
          "cycling#Noun"
        ],
        [
          "bicycle",
          "bicycle"
        ],
        [
          "frame",
          "frame"
        ],
        [
          "bottom bracket",
          "bottom bracket"
        ],
        [
          "head tube",
          "head tube"
        ]
      ],
      "raw_glosses": [
        "(cycling) A tube in the bicycle frame that connects the bottom bracket shell to the head tube."
      ],
      "topics": [
        "cycling",
        "hobbies",
        "lifestyle",
        "sports"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "downtube"
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "part of bicycle frame",
      "word": "alaputki"
    },
    {
      "code": "hu",
      "lang": "Hungarian",
      "sense": "part of bicycle frame",
      "word": "alsó cső"
    }
  ],
  "word": "down tube"
}