"grade-grub" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "grade grubbing"
      },
      "expansion": "Back-formation from grade grubbing",
      "name": "back-formation"
    }
  ],
  "etymology_text": "Back-formation from grade grubbing.",
  "forms": [
    {
      "form": "grade-grubs",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "grade-grubbing",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "grade-grubbed",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "grade-grubbed",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "grade-grub (third-person singular simple present grade-grubs, present participle grade-grubbing, simple past and past participle grade-grubbed)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "American English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English back-formations",
          "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": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Universities",
          "orig": "en:Universities",
          "parents": [
            "Schools",
            "Buildings",
            "Education",
            "Buildings and structures",
            "Society",
            "Architecture",
            "All topics",
            "Applied sciences",
            "Art",
            "Fundamental",
            "Sciences",
            "Culture"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "To engage in grade grubbing."
      ],
      "id": "en-grade-grub-en-verb-Oo6L6J4E",
      "links": [
        [
          "university",
          "university"
        ],
        [
          "slang",
          "slang"
        ],
        [
          "derogatory",
          "derogatory"
        ],
        [
          "engage",
          "engage"
        ],
        [
          "grade grubbing",
          "grade grubbing"
        ]
      ],
      "qualifier": "university slang",
      "raw_glosses": [
        "(intransitive, US, university slang, derogatory) To engage in grade grubbing."
      ],
      "synonyms": [
        {
          "word": "grade grub"
        }
      ],
      "tags": [
        "US",
        "derogatory",
        "intransitive"
      ]
    }
  ],
  "word": "grade-grub"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "grade grubbing"
      },
      "expansion": "Back-formation from grade grubbing",
      "name": "back-formation"
    }
  ],
  "etymology_text": "Back-formation from grade grubbing.",
  "forms": [
    {
      "form": "grade-grubs",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "grade-grubbing",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "grade-grubbed",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "grade-grubbed",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "grade-grub (third-person singular simple present grade-grubs, present participle grade-grubbing, simple past and past participle grade-grubbed)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "American English",
        "English back-formations",
        "English derogatory terms",
        "English entries with incorrect language header",
        "English intransitive verbs",
        "English lemmas",
        "English multiword terms",
        "English student slang",
        "English verbs",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Universities"
      ],
      "glosses": [
        "To engage in grade grubbing."
      ],
      "links": [
        [
          "university",
          "university"
        ],
        [
          "slang",
          "slang"
        ],
        [
          "derogatory",
          "derogatory"
        ],
        [
          "engage",
          "engage"
        ],
        [
          "grade grubbing",
          "grade grubbing"
        ]
      ],
      "qualifier": "university slang",
      "raw_glosses": [
        "(intransitive, US, university slang, derogatory) To engage in grade grubbing."
      ],
      "tags": [
        "US",
        "derogatory",
        "intransitive"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "grade grub"
    }
  ],
  "word": "grade-grub"
}