"underarm crutch" meaning in English

{
  "forms": [
    {
      "form": "underarm crutches",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "underarm crutch (plural underarm crutches)",
      "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": "English retronyms",
          "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": "Mobility aids",
          "orig": "en:Mobility aids",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "A type of crutch that goes under the armpit, as opposed to being held along the lower arm, as with a forearm crutch"
      ],
      "id": "en-underarm_crutch-en-noun-trNCzsQQ",
      "links": [
        [
          "forearm crutch",
          "forearm crutch"
        ]
      ],
      "wikipedia": [
        "Crutch"
      ]
    }
  ],
  "word": "underarm crutch"
}

{
  "forms": [
    {
      "form": "underarm crutches",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "underarm crutch (plural underarm crutches)",
      "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 retronyms",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Mobility aids"
      ],
      "glosses": [
        "A type of crutch that goes under the armpit, as opposed to being held along the lower arm, as with a forearm crutch"
      ],
      "links": [
        [
          "forearm crutch",
          "forearm crutch"
        ]
      ],
      "wikipedia": [
        "Crutch"
      ]
    }
  ],
  "word": "underarm crutch"
}