"buff up" meaning in English

{
  "forms": [
    {
      "form": "buffs up",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "buffing up",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "buffed up",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "buffed up",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "buff up (third-person singular simple present buffs up, present participle buffing up, simple past and past participle buffed up)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [],
      "examples": [
        {
          "ref": "2021 October 17, Katrin Bennhold, “Fake Polls and Tabloid Coverage on Demand: The Dark Side of Sebastian Kurz”, in The New York Times, →ISSN",
          "text": "[…] Mr. Kurz was quickly seen in Europe as the poster boy of an ascendant right for a new generation, a political Wunderkind who had salvaged conservatism by borrowing the far right’s agenda, buffing it up and bringing it into the mainstream.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "To improve."
      ],
      "id": "en-buff_up-en-verb-fbjr7Jlg",
      "links": [
        [
          "improve",
          "improve"
        ]
      ],
      "raw_glosses": [
        "(transitive, idiomatic) To improve."
      ],
      "tags": [
        "idiomatic",
        "transitive"
      ]
    },
    {
      "categories": [],
      "glosses": [
        "To shine; to make shiny."
      ],
      "id": "en-buff_up-en-verb-BQES-EwJ",
      "links": [
        [
          "shine",
          "shine"
        ],
        [
          "shiny",
          "shiny"
        ]
      ],
      "raw_glosses": [
        "(transitive) To shine; to make shiny."
      ],
      "tags": [
        "transitive"
      ]
    },
    {
      "categories": [],
      "glosses": [
        "To become more muscular."
      ],
      "id": "en-buff_up-en-verb-qEdcQ8Cm",
      "links": [
        [
          "muscular",
          "muscular"
        ]
      ],
      "raw_glosses": [
        "(intransitive, idiomatic) To become more muscular."
      ],
      "tags": [
        "idiomatic",
        "intransitive"
      ]
    },
    {
      "categories": [
        {
          "_dis": "16 21 23 40",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "12 16 17 55",
          "kind": "other",
          "name": "English phrasal verbs with particle (up)",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "text": "I'll need to buff up on my Italian before my trip to Genoa.",
          "type": "example"
        }
      ],
      "glosses": [
        "To study hard to learn a particular subject."
      ],
      "id": "en-buff_up-en-verb-1QXHZoep",
      "raw_glosses": [
        "(intransitive, idiomatic) To study hard to learn a particular subject."
      ],
      "synonyms": [
        {
          "word": "cram"
        }
      ],
      "tags": [
        "idiomatic",
        "intransitive"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-au-buff up.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/2/28/En-au-buff_up.ogg/En-au-buff_up.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/2/28/En-au-buff_up.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "buff up"
}

{
  "categories": [
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English phrasal verbs",
    "English phrasal verbs with particle (up)",
    "English terms with audio links",
    "English verbs"
  ],
  "forms": [
    {
      "form": "buffs up",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "buffing up",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "buffed up",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "buffed up",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "buff up (third-person singular simple present buffs up, present participle buffing up, simple past and past participle buffed up)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "English idioms",
        "English terms with quotations",
        "English transitive verbs"
      ],
      "examples": [
        {
          "ref": "2021 October 17, Katrin Bennhold, “Fake Polls and Tabloid Coverage on Demand: The Dark Side of Sebastian Kurz”, in The New York Times, →ISSN",
          "text": "[…] Mr. Kurz was quickly seen in Europe as the poster boy of an ascendant right for a new generation, a political Wunderkind who had salvaged conservatism by borrowing the far right’s agenda, buffing it up and bringing it into the mainstream.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "To improve."
      ],
      "links": [
        [
          "improve",
          "improve"
        ]
      ],
      "raw_glosses": [
        "(transitive, idiomatic) To improve."
      ],
      "tags": [
        "idiomatic",
        "transitive"
      ]
    },
    {
      "categories": [
        "English transitive verbs"
      ],
      "glosses": [
        "To shine; to make shiny."
      ],
      "links": [
        [
          "shine",
          "shine"
        ],
        [
          "shiny",
          "shiny"
        ]
      ],
      "raw_glosses": [
        "(transitive) To shine; to make shiny."
      ],
      "tags": [
        "transitive"
      ]
    },
    {
      "categories": [
        "English idioms",
        "English intransitive verbs"
      ],
      "glosses": [
        "To become more muscular."
      ],
      "links": [
        [
          "muscular",
          "muscular"
        ]
      ],
      "raw_glosses": [
        "(intransitive, idiomatic) To become more muscular."
      ],
      "tags": [
        "idiomatic",
        "intransitive"
      ]
    },
    {
      "categories": [
        "English idioms",
        "English intransitive verbs",
        "English terms with usage examples"
      ],
      "examples": [
        {
          "text": "I'll need to buff up on my Italian before my trip to Genoa.",
          "type": "example"
        }
      ],
      "glosses": [
        "To study hard to learn a particular subject."
      ],
      "raw_glosses": [
        "(intransitive, idiomatic) To study hard to learn a particular subject."
      ],
      "synonyms": [
        {
          "word": "cram"
        }
      ],
      "tags": [
        "idiomatic",
        "intransitive"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-au-buff up.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/2/28/En-au-buff_up.ogg/En-au-buff_up.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/2/28/En-au-buff_up.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "buff up"
}