"leg extension" meaning in English

{
  "antonyms": [
    {
      "sense": "antonym(s) of “exercise”",
      "word": "leg curl"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "leg"
      },
      "expansion": "leg",
      "name": "m"
    },
    {
      "args": {
        "1": "en",
        "2": "extension"
      },
      "expansion": "extension",
      "name": "m"
    }
  ],
  "etymology_text": "From leg + extension.",
  "forms": [
    {
      "form": "leg extensions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "leg extension (plural leg extensions)",
      "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": "topical",
          "langcode": "en",
          "name": "Weightlifting",
          "orig": "en:Weightlifting",
          "parents": [
            "Exercise",
            "Sports",
            "Human activity",
            "Human behaviour",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "An exercise performed on a machine while seated. The quadriceps (thigh muscles) are exerted to straighten the knee while acting against resistance applied to the lower shin."
      ],
      "id": "en-leg_extension-en-noun-y6T-Ee9F",
      "links": [
        [
          "weightlifting",
          "weightlifting"
        ],
        [
          "exercise",
          "exercise"
        ],
        [
          "seated",
          "seated"
        ],
        [
          "quadriceps",
          "quadriceps"
        ],
        [
          "straighten",
          "straighten"
        ],
        [
          "shin",
          "shin"
        ]
      ],
      "raw_glosses": [
        "(weightlifting) An exercise performed on a machine while seated. The quadriceps (thigh muscles) are exerted to straighten the knee while acting against resistance applied to the lower shin."
      ],
      "related": [
        {
          "word": "extension"
        },
        {
          "word": "triceps extension"
        },
        {
          "word": "leg press"
        }
      ],
      "topics": [
        "hobbies",
        "lifestyle",
        "sports",
        "weightlifting"
      ]
    }
  ],
  "word": "leg extension"
}

{
  "antonyms": [
    {
      "sense": "antonym(s) of “exercise”",
      "word": "leg curl"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "leg"
      },
      "expansion": "leg",
      "name": "m"
    },
    {
      "args": {
        "1": "en",
        "2": "extension"
      },
      "expansion": "extension",
      "name": "m"
    }
  ],
  "etymology_text": "From leg + extension.",
  "forms": [
    {
      "form": "leg extensions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "leg extension (plural leg extensions)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "extension"
    },
    {
      "word": "triceps extension"
    },
    {
      "word": "leg press"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "en:Weightlifting"
      ],
      "glosses": [
        "An exercise performed on a machine while seated. The quadriceps (thigh muscles) are exerted to straighten the knee while acting against resistance applied to the lower shin."
      ],
      "links": [
        [
          "weightlifting",
          "weightlifting"
        ],
        [
          "exercise",
          "exercise"
        ],
        [
          "seated",
          "seated"
        ],
        [
          "quadriceps",
          "quadriceps"
        ],
        [
          "straighten",
          "straighten"
        ],
        [
          "shin",
          "shin"
        ]
      ],
      "raw_glosses": [
        "(weightlifting) An exercise performed on a machine while seated. The quadriceps (thigh muscles) are exerted to straighten the knee while acting against resistance applied to the lower shin."
      ],
      "topics": [
        "hobbies",
        "lifestyle",
        "sports",
        "weightlifting"
      ]
    }
  ],
  "word": "leg extension"
}