"too big for one's britches" meaning in English

{
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      "expansion": "19th c.",
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  "etymology_text": "US origin, 19th c.",
  "head_templates": [
    {
      "args": {
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      "expansion": "too big for one's britches (not comparable)",
      "name": "en-adj"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
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          "kind": "other",
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      "examples": [
        {
          "ref": "1989 May 22, Edwin M. Reingold, “Hard Times for Teflon Tom”, in Time",
          "text": "A diffident, dedicated man, Bradley seemed the personification of rectitude. He never got too big for his britches.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Disturbingly confident, unacceptably cocky."
      ],
      "id": "en-too_big_for_one's_britches-en-adj-16iV-AJB",
      "links": [
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          "confident",
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          "unacceptably",
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        [
          "cocky",
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        ]
      ],
      "raw_glosses": [
        "(idiomatic) Disturbingly confident, unacceptably cocky."
      ],
      "synonyms": [
        {
          "word": "too big for one's boots"
        }
      ],
      "tags": [
        "idiomatic",
        "not-comparable"
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      "glosses": [
        "Used other than figuratively or idiomatically: Too large to fit into one's pants."
      ],
      "id": "en-too_big_for_one's_britches-en-adj-9h1JkVcm",
      "links": [
        [
          "large",
          "large"
        ],
        [
          "pants",
          "pants"
        ]
      ],
      "synonyms": [
        {
          "_dis1": "7 93",
          "word": "too big for one's breeches"
        }
      ],
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        "not-comparable"
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      "tags": [
        "Australia"
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      "text": "Audio (AU)"
    }
  ],
  "word": "too big for one's britches"
}

{
  "categories": [
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    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English terms with audio links",
    "English uncomparable adjectives"
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  "etymology_templates": [
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      "expansion": "19th c.",
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  "etymology_text": "US origin, 19th c.",
  "head_templates": [
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      "expansion": "too big for one's britches (not comparable)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
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      "categories": [
        "English idioms",
        "English terms with quotations"
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      "examples": [
        {
          "ref": "1989 May 22, Edwin M. Reingold, “Hard Times for Teflon Tom”, in Time",
          "text": "A diffident, dedicated man, Bradley seemed the personification of rectitude. He never got too big for his britches.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Disturbingly confident, unacceptably cocky."
      ],
      "links": [
        [
          "confident",
          "confident"
        ],
        [
          "unacceptably",
          "unacceptably"
        ],
        [
          "cocky",
          "cocky"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) Disturbingly confident, unacceptably cocky."
      ],
      "synonyms": [
        {
          "word": "too big for one's boots"
        }
      ],
      "tags": [
        "idiomatic",
        "not-comparable"
      ]
    },
    {
      "categories": [
        "&lit not valid pagename"
      ],
      "glosses": [
        "Used other than figuratively or idiomatically: Too large to fit into one's pants."
      ],
      "links": [
        [
          "large",
          "large"
        ],
        [
          "pants",
          "pants"
        ]
      ],
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  "synonyms": [
    {
      "word": "too big for one's breeches"
    }
  ],
  "word": "too big for one's britches"
}