Etymology of BMX

Raw extraction fields are retained for auditing. Their order does not establish ancestry.

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        "1": "en",
        "2": "bicycle motocross"
      },
      "expansion": "Initialism of bicycle motocross"
    }
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    [
      "bicycle",
      "bicycle#English"
    ],
    [
      "motocross",
      "motocross#English"
    ]
  ],
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  "descendants": [],
  "lexical": [
    {
      "pos": "verb",
      "glosses": [
        "To ride a BMX bike."
      ],
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        "intransitive"
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    {
      "pos": "noun",
      "glosses": [
        "Bicycle motocross, a form of cycling on BMX bikes, originating in California in the 1970s.",
        "A BMX bike."
      ],
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        "uncountable",
        "countable"
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      "sourceRecordOrdinal": 303437
    },
    {
      "pos": "adj",
      "glosses": [
        "Relating to bicycle motocross."
      ],
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