"rocks for jocks" meaning in English

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      "expansion": "rocks for jocks (uncountable)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "kind": "topical",
          "langcode": "en",
          "name": "College sports",
          "orig": "en:College sports",
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            "Sports",
            "Universities",
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          "name": "Education",
          "orig": "en:Education",
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            "Fundamental"
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Geology",
          "orig": "en:Geology",
          "parents": [
            "Earth sciences",
            "Sciences",
            "All topics",
            "Fundamental"
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          "source": "w"
        }
      ],
      "glosses": [
        "An introductory course in geology that is attended by student athletes who for legal reasons must attend classes in order to continue playing their sport competitively."
      ],
      "id": "en-rocks_for_jocks-en-noun-fBVPCwOW",
      "links": [
        [
          "introductory",
          "introductory"
        ],
        [
          "geology",
          "geology"
        ],
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          "student athlete",
          "student athlete"
        ],
        [
          "sport",
          "sport"
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      "raw_glosses": [
        "(informal, US) An introductory course in geology that is attended by student athletes who for legal reasons must attend classes in order to continue playing their sport competitively."
      ],
      "tags": [
        "US",
        "informal",
        "uncountable"
      ]
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  ],
  "word": "rocks for jocks"
}

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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "en:College sports",
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        "en:Geology"
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        "An introductory course in geology that is attended by student athletes who for legal reasons must attend classes in order to continue playing their sport competitively."
      ],
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        [
          "introductory",
          "introductory"
        ],
        [
          "geology",
          "geology"
        ],
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          "student athlete",
          "student athlete"
        ],
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          "sport",
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        "(informal, US) An introductory course in geology that is attended by student athletes who for legal reasons must attend classes in order to continue playing their sport competitively."
      ],
      "tags": [
        "US",
        "informal",
        "uncountable"
      ]
    }
  ],
  "word": "rocks for jocks"
}