"thick end" meaning in English

{
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    {
      "form": "the thick end",
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        "2": "noun",
        "head": "the thick end"
      },
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    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "British English",
          "parents": [],
          "source": "w"
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      "examples": [
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          "bold_text_offsets": [
            [
              30,
              39
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          "ref": "2014, East End at War and Peace, Michael Russell, page 195:",
          "text": "How much did the M1 cost? The thick end of £20M pounds, in fact. Yet the limited availabity of taxpayers' money meant that Britain could never hope to compete with the two world superpowers, Russia and the USA, […]",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Most; the greater part (of an amount of money)."
      ],
      "id": "en-thick_end-en-noun-QJJulwxT",
      "raw_glosses": [
        "(UK, colloquial, idiomatic) Most; the greater part (of an amount of money)."
      ],
      "tags": [
        "UK",
        "colloquial",
        "idiomatic"
      ]
    }
  ],
  "word": "thick end"
}

{
  "forms": [
    {
      "form": "the thick end",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "noun",
        "head": "the thick end"
      },
      "expansion": "the thick end",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        "British English",
        "English colloquialisms",
        "English entries with incorrect language header",
        "English idioms",
        "English lemmas",
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        "Quotation templates to be cleaned"
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          "ref": "2014, East End at War and Peace, Michael Russell, page 195:",
          "text": "How much did the M1 cost? The thick end of £20M pounds, in fact. Yet the limited availabity of taxpayers' money meant that Britain could never hope to compete with the two world superpowers, Russia and the USA, […]",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Most; the greater part (of an amount of money)."
      ],
      "raw_glosses": [
        "(UK, colloquial, idiomatic) Most; the greater part (of an amount of money)."
      ],
      "tags": [
        "UK",
        "colloquial",
        "idiomatic"
      ]
    }
  ],
  "word": "thick end"
}