"young gun" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "young'un"
      },
      "expansion": "young'un",
      "name": "m"
    }
  ],
  "etymology_text": "Possibly a play on young'un.",
  "forms": [
    {
      "form": "young guns",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "young gun (plural young guns)",
      "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"
        }
      ],
      "examples": [
        {
          "ref": "2021 January 30, Tanya Sweeney, “The Irish architect who became the ‘megamansion king’ of LA”, in The Irish Times",
          "text": "[…] McKillen – not a man to entrust just anyone to build his homes – clearly had huge faith in the young gun.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A new or rising talent or star; rising star."
      ],
      "id": "en-young_gun-en-noun-~MSum5a4",
      "links": [
        [
          "rising star",
          "rising star"
        ]
      ],
      "raw_glosses": [
        "(informal) A new or rising talent or star; rising star."
      ],
      "tags": [
        "informal"
      ]
    }
  ],
  "word": "young gun"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "young'un"
      },
      "expansion": "young'un",
      "name": "m"
    }
  ],
  "etymology_text": "Possibly a play on young'un.",
  "forms": [
    {
      "form": "young guns",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "young gun (plural young guns)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English informal terms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "2021 January 30, Tanya Sweeney, “The Irish architect who became the ‘megamansion king’ of LA”, in The Irish Times",
          "text": "[…] McKillen – not a man to entrust just anyone to build his homes – clearly had huge faith in the young gun.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A new or rising talent or star; rising star."
      ],
      "links": [
        [
          "rising star",
          "rising star"
        ]
      ],
      "raw_glosses": [
        "(informal) A new or rising talent or star; rising star."
      ],
      "tags": [
        "informal"
      ]
    }
  ],
  "word": "young gun"
}