"Mexican overdrive" meaning in English

{
  "etymology_text": "Based on NASCAR teams' experience in the early 1950s in the legendary Carerra Panamerica, where the long hills would have otherwise overrevved the engines.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "Mexican overdrive (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "American English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Automotive",
          "orig": "en:Automotive",
          "parents": [
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "He shifted his car out of gear, at the top of the hill, and coasted down in Mexican overdrive."
        }
      ],
      "glosses": [
        "The neutral gear when used while a vehicle is moving, especially when it is used to save fuel or to coast downhill faster than a vehicle can go in gear. (This is illegal in some places.)"
      ],
      "id": "en-Mexican_overdrive-en-noun-8H3ksyyA",
      "links": [
        [
          "automotive",
          "automotive"
        ]
      ],
      "raw_glosses": [
        "(US, slang, automotive) The neutral gear when used while a vehicle is moving, especially when it is used to save fuel or to coast downhill faster than a vehicle can go in gear. (This is illegal in some places.)"
      ],
      "synonyms": [
        {
          "word": "freewheel"
        },
        {
          "word": "angel gear"
        },
        {
          "word": "Georgia overdrive"
        }
      ],
      "tags": [
        "US",
        "slang",
        "uncountable"
      ],
      "topics": [
        "automotive",
        "transport",
        "vehicles"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-Mexican overdrive.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/b/be/En-au-Mexican_overdrive.ogg/En-au-Mexican_overdrive.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/b/be/En-au-Mexican_overdrive.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "Mexican overdrive"
}

{
  "etymology_text": "Based on NASCAR teams' experience in the early 1950s in the legendary Carerra Panamerica, where the long hills would have otherwise overrevved the engines.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "Mexican overdrive (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "American English",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English slang",
        "English terms derived from toponyms",
        "English terms with audio links",
        "English terms with non-redundant non-automated sortkeys",
        "English uncountable nouns",
        "en:Automotive"
      ],
      "examples": [
        {
          "text": "He shifted his car out of gear, at the top of the hill, and coasted down in Mexican overdrive."
        }
      ],
      "glosses": [
        "The neutral gear when used while a vehicle is moving, especially when it is used to save fuel or to coast downhill faster than a vehicle can go in gear. (This is illegal in some places.)"
      ],
      "links": [
        [
          "automotive",
          "automotive"
        ]
      ],
      "raw_glosses": [
        "(US, slang, automotive) The neutral gear when used while a vehicle is moving, especially when it is used to save fuel or to coast downhill faster than a vehicle can go in gear. (This is illegal in some places.)"
      ],
      "tags": [
        "US",
        "slang",
        "uncountable"
      ],
      "topics": [
        "automotive",
        "transport",
        "vehicles"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-Mexican overdrive.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/b/be/En-au-Mexican_overdrive.ogg/En-au-Mexican_overdrive.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/b/be/En-au-Mexican_overdrive.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "synonyms": [
    {
      "word": "freewheel"
    },
    {
      "word": "angel gear"
    },
    {
      "word": "Georgia overdrive"
    }
  ],
  "word": "Mexican overdrive"
}