"self-built" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "self",
        "3": "built"
      },
      "expansion": "self- + built",
      "name": "prefix"
    }
  ],
  "etymology_text": "From self- + built.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "self-built (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "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 terms prefixed with self-",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Entries with translation boxes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Italian translations",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "a self-built car"
        }
      ],
      "glosses": [
        "built by oneself, often from commercially available components"
      ],
      "id": "en-self-built-en-adj-68EVIwAC",
      "links": [
        [
          "built",
          "built"
        ]
      ],
      "tags": [
        "not-comparable"
      ],
      "translations": [
        {
          "code": "it",
          "lang": "Italian",
          "sense": "built by oneself",
          "word": "autocostruito"
        }
      ]
    }
  ],
  "word": "self-built"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "self",
        "3": "built"
      },
      "expansion": "self- + built",
      "name": "prefix"
    }
  ],
  "etymology_text": "From self- + built.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "self-built (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English terms prefixed with self-",
        "English uncomparable adjectives",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with Italian translations"
      ],
      "examples": [
        {
          "text": "a self-built car"
        }
      ],
      "glosses": [
        "built by oneself, often from commercially available components"
      ],
      "links": [
        [
          "built",
          "built"
        ]
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "translations": [
    {
      "code": "it",
      "lang": "Italian",
      "sense": "built by oneself",
      "word": "autocostruito"
    }
  ],
  "word": "self-built"
}