"chain tensioner" meaning in English

{
  "forms": [
    {
      "form": "chain tensioners",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "chain tensioner (plural chain tensioners)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Cycling",
          "orig": "en:Cycling",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "A mechanical or hydraulic device used to maintain correct, steady tension on a drive or timing chain; it prevents the chain from becoming too loose, which stops it from slipping off sprockets or rattling."
      ],
      "id": "en-chain_tensioner-en-noun-QSmhTz5o",
      "links": [
        [
          "cycling",
          "cycling#Noun"
        ],
        [
          "mechanical",
          "mechanical"
        ],
        [
          "hydraulic",
          "hydraulic"
        ],
        [
          "drive",
          "drive chain"
        ],
        [
          "timing chain",
          "timing chain"
        ],
        [
          "sprockets",
          "sprockets"
        ]
      ],
      "raw_glosses": [
        "(cycling) A mechanical or hydraulic device used to maintain correct, steady tension on a drive or timing chain; it prevents the chain from becoming too loose, which stops it from slipping off sprockets or rattling."
      ],
      "topics": [
        "cycling",
        "hobbies",
        "lifestyle",
        "sports"
      ]
    }
  ],
  "word": "chain tensioner"
}

{
  "forms": [
    {
      "form": "chain tensioners",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "chain tensioner (plural chain tensioners)",
      "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",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Cycling"
      ],
      "glosses": [
        "A mechanical or hydraulic device used to maintain correct, steady tension on a drive or timing chain; it prevents the chain from becoming too loose, which stops it from slipping off sprockets or rattling."
      ],
      "links": [
        [
          "cycling",
          "cycling#Noun"
        ],
        [
          "mechanical",
          "mechanical"
        ],
        [
          "hydraulic",
          "hydraulic"
        ],
        [
          "drive",
          "drive chain"
        ],
        [
          "timing chain",
          "timing chain"
        ],
        [
          "sprockets",
          "sprockets"
        ]
      ],
      "raw_glosses": [
        "(cycling) A mechanical or hydraulic device used to maintain correct, steady tension on a drive or timing chain; it prevents the chain from becoming too loose, which stops it from slipping off sprockets or rattling."
      ],
      "topics": [
        "cycling",
        "hobbies",
        "lifestyle",
        "sports"
      ]
    }
  ],
  "word": "chain tensioner"
}