"U-bend" meaning in English

{
  "forms": [
    {
      "form": "U-bends",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "U-bend (plural U-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"
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          "source": "w"
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          "parents": [],
          "source": "w"
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          "name": "Terms with Greek translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Irish translations",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "A U-shaped bend, usually the bend in a waste pipe."
      ],
      "id": "en-U-bend-en-noun-PbSrjmDe",
      "links": [
        [
          "U-shaped",
          "U-shaped"
        ]
      ],
      "synonyms": [
        {
          "word": "return bend"
        }
      ],
      "translations": [
        {
          "code": "el",
          "lang": "Greek",
          "roman": "sifóni",
          "sense": "a U-shaped bend",
          "tags": [
            "neuter"
          ],
          "word": "σιφόνι"
        },
        {
          "code": "ga",
          "lang": "Irish",
          "sense": "a U-shaped bend",
          "tags": [
            "feminine"
          ],
          "word": "U-lúb"
        }
      ]
    }
  ],
  "word": "U-bend"
}

{
  "forms": [
    {
      "form": "U-bends",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "U-bend (plural U-bends)",
      "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",
        "English terms derived from the shape of letters",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with Greek translations",
        "Terms with Irish translations"
      ],
      "glosses": [
        "A U-shaped bend, usually the bend in a waste pipe."
      ],
      "links": [
        [
          "U-shaped",
          "U-shaped"
        ]
      ],
      "synonyms": [
        {
          "word": "return bend"
        }
      ]
    }
  ],
  "translations": [
    {
      "code": "el",
      "lang": "Greek",
      "roman": "sifóni",
      "sense": "a U-shaped bend",
      "tags": [
        "neuter"
      ],
      "word": "σιφόνι"
    },
    {
      "code": "ga",
      "lang": "Irish",
      "sense": "a U-shaped bend",
      "tags": [
        "feminine"
      ],
      "word": "U-lúb"
    }
  ],
  "word": "U-bend"
}