"mug up" meaning in English

{
  "forms": [
    {
      "form": "mugs up",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "mugging up",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "mugged up",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "mugged up",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "mug up (third-person singular simple present mugs up, present participle mugging up, simple past and past participle mugged up)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [],
      "examples": [
        {
          "text": "I mugged up on the meaning of road signs before taking my driving test.",
          "type": "example"
        }
      ],
      "glosses": [
        "To study intensely."
      ],
      "id": "en-mug_up-en-verb-YOtiV91p",
      "links": [
        [
          "study",
          "study"
        ],
        [
          "intensely",
          "intensely"
        ]
      ],
      "raw_glosses": [
        "(intransitive, slang) To study intensely."
      ],
      "synonyms": [
        {
          "word": "bone up"
        },
        {
          "word": "buff up"
        },
        {
          "word": "cram"
        }
      ],
      "tags": [
        "intransitive",
        "slang"
      ]
    },
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Theater",
          "orig": "en:Theater",
          "parents": [
            "Art",
            "Entertainment",
            "Culture",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "_dis": "17 83",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "25 75",
          "kind": "other",
          "name": "English phrasal verbs with particle (up)",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "To paint one's face or put on a costume for the purpose of impersonation."
      ],
      "id": "en-mug_up-en-verb-ABehd6wH",
      "links": [
        [
          "theater",
          "theater"
        ],
        [
          "impersonation",
          "impersonation"
        ]
      ],
      "raw_glosses": [
        "(intransitive, slang, theater, obsolete) To paint one's face or put on a costume for the purpose of impersonation."
      ],
      "tags": [
        "intransitive",
        "obsolete",
        "slang"
      ],
      "topics": [
        "entertainment",
        "lifestyle",
        "theater"
      ]
    }
  ],
  "word": "mug up"
}

{
  "categories": [
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English phrasal verbs",
    "English phrasal verbs with particle (up)",
    "English verbs"
  ],
  "forms": [
    {
      "form": "mugs up",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "mugging up",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "mugged up",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "mugged up",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "mug up (third-person singular simple present mugs up, present participle mugging up, simple past and past participle mugged up)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "English intransitive verbs",
        "English slang",
        "English terms with usage examples"
      ],
      "examples": [
        {
          "text": "I mugged up on the meaning of road signs before taking my driving test.",
          "type": "example"
        }
      ],
      "glosses": [
        "To study intensely."
      ],
      "links": [
        [
          "study",
          "study"
        ],
        [
          "intensely",
          "intensely"
        ]
      ],
      "raw_glosses": [
        "(intransitive, slang) To study intensely."
      ],
      "synonyms": [
        {
          "word": "bone up"
        },
        {
          "word": "buff up"
        },
        {
          "word": "cram"
        }
      ],
      "tags": [
        "intransitive",
        "slang"
      ]
    },
    {
      "categories": [
        "English intransitive verbs",
        "English slang",
        "English terms with obsolete senses",
        "en:Theater"
      ],
      "glosses": [
        "To paint one's face or put on a costume for the purpose of impersonation."
      ],
      "links": [
        [
          "theater",
          "theater"
        ],
        [
          "impersonation",
          "impersonation"
        ]
      ],
      "raw_glosses": [
        "(intransitive, slang, theater, obsolete) To paint one's face or put on a costume for the purpose of impersonation."
      ],
      "tags": [
        "intransitive",
        "obsolete",
        "slang"
      ],
      "topics": [
        "entertainment",
        "lifestyle",
        "theater"
      ]
    }
  ],
  "word": "mug up"
}