"baselayer" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "base",
        "3": "layer"
      },
      "expansion": "base + layer",
      "name": "compound"
    }
  ],
  "etymology_text": "From base + layer.",
  "forms": [
    {
      "form": "baselayers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "baselayer (plural baselayers)",
      "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": "Clothing",
          "orig": "en:Clothing",
          "parents": [
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A tight undergarment worn to strengthen muscles. It provides compression which helps an athlete's performance."
      ],
      "id": "en-baselayer-en-noun-ePR9Uo1M",
      "links": [
        [
          "tight",
          "tight"
        ],
        [
          "undergarment",
          "undergarment"
        ],
        [
          "strengthen",
          "strengthen"
        ],
        [
          "muscles",
          "muscles"
        ],
        [
          "compression",
          "compression"
        ]
      ]
    }
  ],
  "word": "baselayer"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "base",
        "3": "layer"
      },
      "expansion": "base + layer",
      "name": "compound"
    }
  ],
  "etymology_text": "From base + layer.",
  "forms": [
    {
      "form": "baselayers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "baselayer (plural baselayers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English 3-syllable words",
        "English compound terms",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Clothing"
      ],
      "glosses": [
        "A tight undergarment worn to strengthen muscles. It provides compression which helps an athlete's performance."
      ],
      "links": [
        [
          "tight",
          "tight"
        ],
        [
          "undergarment",
          "undergarment"
        ],
        [
          "strengthen",
          "strengthen"
        ],
        [
          "muscles",
          "muscles"
        ],
        [
          "compression",
          "compression"
        ]
      ]
    }
  ],
  "word": "baselayer"
}