"not half" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "not half (not comparable)",
      "name": "en-adv"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adv",
  "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"
        }
      ],
      "examples": [
        {
          "text": "\"So you fancy that girl then?\" \"Not half!\"",
          "type": "example"
        },
        {
          "ref": "1902, The Windsor Magazine: An Illustrated Monthly for Men and Women, Vol. XVI June to November 1902",
          "text": "\"You bet she wouldn't like fer me to be killed—not 'arf!...\"",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Greatly; to a considerable extent."
      ],
      "id": "en-not_half-en-adv-6e9rI5JM",
      "links": [
        [
          "Greatly",
          "greatly"
        ]
      ],
      "raw_glosses": [
        "(British, slang) Greatly; to a considerable extent."
      ],
      "related": [
        {
          "word": "not half bad"
        }
      ],
      "tags": [
        "British",
        "not-comparable",
        "slang"
      ],
      "translations": [
        {
          "code": "hu",
          "lang": "Hungarian",
          "word": "még szép"
        },
        {
          "code": "hu",
          "lang": "Hungarian",
          "word": "naná"
        }
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-not half.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/e/ed/En-au-not_half.ogg/En-au-not_half.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/e/ed/En-au-not_half.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "not half"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "not half (not comparable)",
      "name": "en-adv"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adv",
  "related": [
    {
      "word": "not half bad"
    }
  ],
  "senses": [
    {
      "categories": [
        "British English",
        "English adverbs",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English slang",
        "English terms with audio links",
        "English terms with quotations",
        "English terms with usage examples",
        "English uncomparable adverbs"
      ],
      "examples": [
        {
          "text": "\"So you fancy that girl then?\" \"Not half!\"",
          "type": "example"
        },
        {
          "ref": "1902, The Windsor Magazine: An Illustrated Monthly for Men and Women, Vol. XVI June to November 1902",
          "text": "\"You bet she wouldn't like fer me to be killed—not 'arf!...\"",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Greatly; to a considerable extent."
      ],
      "links": [
        [
          "Greatly",
          "greatly"
        ]
      ],
      "raw_glosses": [
        "(British, slang) Greatly; to a considerable extent."
      ],
      "tags": [
        "British",
        "not-comparable",
        "slang"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-not half.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/e/ed/En-au-not_half.ogg/En-au-not_half.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/e/ed/En-au-not_half.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "translations": [
    {
      "code": "hu",
      "lang": "Hungarian",
      "word": "még szép"
    },
    {
      "code": "hu",
      "lang": "Hungarian",
      "word": "naná"
    }
  ],
  "word": "not half"
}

{
  "called_from": "page/2517",
  "msg": "UNIMPLEMENTED parse_translation_template: trans-top-see {1: 'greatly, to a considerable extent', 2: 'greatly'}",
  "path": [
    "not half",
    "trans-top-see"
  ],
  "section": "English",
  "subsection": "adverb",
  "title": "not half",
  "trace": ""
}