"S-bend" meaning in English

{
  "forms": [
    {
      "form": "S-bends",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "S-bend (plural S-bends)",
      "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": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Roads",
          "orig": "en:Roads",
          "parents": [
            "Road transport",
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1950 April, Timothy H. Cobb, “The Kenya-Uganda Railway”, in Railway Magazine, page 266:",
          "text": "The line to Uganda goes up the side of a slope in a series of S-bends, and as the telegraph wires follow the line, from below they look like a forest as they thread backwards and forwards about six times.",
          "type": "quote"
        }
      ],
      "glosses": [
        "An S-shaped bend, usually the bend in a waste pipe, or in a road."
      ],
      "id": "en-S-bend-en-noun-KmAJ52JL",
      "links": [
        [
          "S-shaped",
          "S-shaped"
        ]
      ],
      "related": [
        {
          "word": "reverse curve"
        }
      ]
    }
  ],
  "word": "S-bend"
}

{
  "forms": [
    {
      "form": "S-bends",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "S-bend (plural S-bends)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "reverse curve"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms derived from the shape of letters",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Roads"
      ],
      "examples": [
        {
          "ref": "1950 April, Timothy H. Cobb, “The Kenya-Uganda Railway”, in Railway Magazine, page 266:",
          "text": "The line to Uganda goes up the side of a slope in a series of S-bends, and as the telegraph wires follow the line, from below they look like a forest as they thread backwards and forwards about six times.",
          "type": "quote"
        }
      ],
      "glosses": [
        "An S-shaped bend, usually the bend in a waste pipe, or in a road."
      ],
      "links": [
        [
          "S-shaped",
          "S-shaped"
        ]
      ]
    }
  ],
  "word": "S-bend"
}