"hell for leather" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "hell for leather (not comparable)",
      "name": "en-adv"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1963, Frederick Barnardo, An Active Life, Bodley Head, page 194",
          "text": "A few minutes later I was driving hell for leather to Parel, some six miles out of Bombay, where Colonel Liston was in charge of the government laboratory.",
          "type": "quotation"
        },
        {
          "ref": "1988, Emma Lange, The Cost of Honor, page 96",
          "text": "It was one of the pleasures of the country to be able to ride hell for leather in the early morning... .",
          "type": "quotation"
        },
        {
          "ref": "2003 October 18, Francis Spufford, “Masters of their universe”, in The Guardian",
          "text": "Of course, we were programmers, so we knew how hard it was, and what really impressed us was that this wasn't just smart programming, it was smart maths. Somebody had gone hell for leather making the absolute best that was possible.",
          "type": "quotation"
        },
        {
          "ref": "2004, Jennifer Marshall, The Christie Legacy, Trafford Publishing, page 290",
          "text": "When Alfie had breathlessly told him that Sarah had gone into labour and was on her way to hospital, he'd dropped the lead rein and headed back hell for leather.",
          "type": "quotation"
        }
      ],
      "form_of": [
        {
          "word": "hell-for-leather"
        }
      ],
      "glosses": [
        "Less common form of hell-for-leather"
      ],
      "id": "en-hell_for_leather-en-adv-bnUe-qnd",
      "links": [
        [
          "hell-for-leather",
          "hell-for-leather#English"
        ]
      ],
      "tags": [
        "form-of",
        "not-comparable",
        "uncommon"
      ]
    }
  ],
  "word": "hell for leather"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "hell for leather (not comparable)",
      "name": "en-adv"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        "English adverbs",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English terms with quotations",
        "English uncomparable adverbs",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "1963, Frederick Barnardo, An Active Life, Bodley Head, page 194",
          "text": "A few minutes later I was driving hell for leather to Parel, some six miles out of Bombay, where Colonel Liston was in charge of the government laboratory.",
          "type": "quotation"
        },
        {
          "ref": "1988, Emma Lange, The Cost of Honor, page 96",
          "text": "It was one of the pleasures of the country to be able to ride hell for leather in the early morning... .",
          "type": "quotation"
        },
        {
          "ref": "2003 October 18, Francis Spufford, “Masters of their universe”, in The Guardian",
          "text": "Of course, we were programmers, so we knew how hard it was, and what really impressed us was that this wasn't just smart programming, it was smart maths. Somebody had gone hell for leather making the absolute best that was possible.",
          "type": "quotation"
        },
        {
          "ref": "2004, Jennifer Marshall, The Christie Legacy, Trafford Publishing, page 290",
          "text": "When Alfie had breathlessly told him that Sarah had gone into labour and was on her way to hospital, he'd dropped the lead rein and headed back hell for leather.",
          "type": "quotation"
        }
      ],
      "form_of": [
        {
          "word": "hell-for-leather"
        }
      ],
      "glosses": [
        "Less common form of hell-for-leather"
      ],
      "links": [
        [
          "hell-for-leather",
          "hell-for-leather#English"
        ]
      ],
      "tags": [
        "form-of",
        "not-comparable",
        "uncommon"
      ]
    }
  ],
  "word": "hell for leather"
}