"squab chick" meaning in English

{
  "forms": [
    {
      "form": "squab chicks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "squab chick (plural squab chicks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "British English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A young chicken before it is fully fledged."
      ],
      "id": "en-squab_chick-en-noun-VpVLgX1n",
      "links": [
        [
          "chicken",
          "chicken"
        ],
        [
          "fledged",
          "fledged"
        ]
      ],
      "raw_glosses": [
        "(UK, dialect) A young chicken before it is fully fledged."
      ],
      "tags": [
        "UK",
        "dialectal"
      ]
    }
  ],
  "word": "squab chick"
}

{
  "forms": [
    {
      "form": "squab chicks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "squab chick (plural squab chicks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "British English",
        "English countable nouns",
        "English dialectal terms",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns"
      ],
      "glosses": [
        "A young chicken before it is fully fledged."
      ],
      "links": [
        [
          "chicken",
          "chicken"
        ],
        [
          "fledged",
          "fledged"
        ]
      ],
      "raw_glosses": [
        "(UK, dialect) A young chicken before it is fully fledged."
      ],
      "tags": [
        "UK",
        "dialectal"
      ]
    }
  ],
  "word": "squab chick"
}