"beef up" meaning in English

{
  "etymology_text": "Originally college slang, from beef (“muscle-power”).",
  "forms": [
    {
      "form": "beefs up",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "beefing up",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "beefed up",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "beefed up",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "beef up (third-person singular simple present beefs up, present participle beefing up, simple past and past participle beefed up)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English phrasal verbs formed with \"up\"",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "We need to beef up security around the airport.",
          "type": "example"
        }
      ],
      "glosses": [
        "To strengthen or reinforce; to add substance to."
      ],
      "id": "en-beef_up-en-verb-8W6SegGz",
      "links": [
        [
          "strengthen",
          "strengthen"
        ],
        [
          "reinforce",
          "reinforce"
        ]
      ],
      "raw_glosses": [
        "(slang, transitive) To strengthen or reinforce; to add substance to."
      ],
      "related": [
        {
          "word": "beef"
        },
        {
          "word": "beefed out"
        },
        {
          "word": "beefed up"
        },
        {
          "word": "beef out"
        },
        {
          "word": "beefy"
        }
      ],
      "tags": [
        "slang",
        "transitive"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-au-beef up.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/d/df/En-au-beef_up.ogg/En-au-beef_up.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/d/df/En-au-beef_up.ogg"
    }
  ],
  "word": "beef up"
}

{
  "etymology_text": "Originally college slang, from beef (“muscle-power”).",
  "forms": [
    {
      "form": "beefs up",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "beefing up",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "beefed up",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "beefed up",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "beef up (third-person singular simple present beefs up, present participle beefing up, simple past and past participle beefed up)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "related": [
    {
      "word": "beef"
    },
    {
      "word": "beefed out"
    },
    {
      "word": "beefed up"
    },
    {
      "word": "beef out"
    },
    {
      "word": "beefy"
    }
  ],
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English phrasal verbs",
        "English phrasal verbs formed with \"up\"",
        "English slang",
        "English terms with usage examples",
        "English transitive verbs",
        "English verbs",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "text": "We need to beef up security around the airport.",
          "type": "example"
        }
      ],
      "glosses": [
        "To strengthen or reinforce; to add substance to."
      ],
      "links": [
        [
          "strengthen",
          "strengthen"
        ],
        [
          "reinforce",
          "reinforce"
        ]
      ],
      "raw_glosses": [
        "(slang, transitive) To strengthen or reinforce; to add substance to."
      ],
      "tags": [
        "slang",
        "transitive"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-au-beef up.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/d/df/En-au-beef_up.ogg/En-au-beef_up.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/d/df/En-au-beef_up.ogg"
    }
  ],
  "word": "beef up"
}