"wheels of steel" meaning in English

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  "lang_code": "en",
  "pos": "noun",
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      "examples": [
        {
          "ref": "2000, Darren O'Donnell, Your Secrets Sleep With Me, page 58:",
          "text": "She feels she should fit right in, charming the populace on the wheels of steel. 'Music is my lover,' she is fond of saying. She's looking for a universal groove, something that everyone can, somehow, in whatever small way, relate to.",
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        {
          "ref": "2001, CMJ New Music Monthly, number 97, page 85:",
          "text": "With Pam The Funkstress on the wheels of steel, every track provides plenty of forward motion without sacrificing the music's vertical pleasures.",
          "type": "quote"
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        {
          "ref": "2004, Enakhe O, Who Is My Brother's Keeper?, page 253:",
          "text": "“Let's see if you can keep up,” she said as the ragga music touched everybody. Melanie-Jo, working the wheels of steel, waved at Jayden and he waved back.",
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      "glosses": [
        "A disc jockey or record scratcher's turntables."
      ],
      "id": "en-wheels_of_steel-en-noun-1h09WUHD",
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          "disc jockey",
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          "record",
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          "scratcher",
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          "turntable",
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        "(slang) A disc jockey or record scratcher's turntables."
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      "related": [
        {
          "word": "stacks of wax"
        },
        {
          "word": "steel wheels"
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  "word": "wheels of steel"
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      "word": "stacks of wax"
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      "word": "steel wheels"
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          "ref": "2004, Enakhe O, Who Is My Brother's Keeper?, page 253:",
          "text": "“Let's see if you can keep up,” she said as the ragga music touched everybody. Melanie-Jo, working the wheels of steel, waved at Jayden and he waved back.",
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  "word": "wheels of steel"
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