"have one's back up" meaning in English

{
  "forms": [
    {
      "form": "has one's back up",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "having one's back up",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "had one's back up",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "had one's back up",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "have<has,,had> one's back up"
      },
      "expansion": "have one's back up (third-person singular simple present has one's back up, present participle having one's back up, simple past and past participle had one's back 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": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "He's had his back up all morning. There's no point in trying to talk to him.",
          "type": "example"
        }
      ],
      "glosses": [
        "To be angry or defensive."
      ],
      "id": "en-have_one's_back_up-en-verb-saoFNuRF",
      "links": [
        [
          "angry",
          "angry"
        ],
        [
          "defensive",
          "defensive"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) To be angry or defensive."
      ],
      "related": [
        {
          "word": "put someone's back up"
        },
        {
          "word": "raise someone's hackles"
        },
        {
          "word": "ruffle some feathers"
        },
        {
          "word": "get someone's back up"
        }
      ],
      "synonyms": [
        {
          "word": "get one's dander up"
        },
        {
          "word": "get one's Irish up"
        }
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-au-have one's back up.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/6/6c/En-au-have_one%27s_back_up.ogg/En-au-have_one%27s_back_up.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/6/6c/En-au-have_one%27s_back_up.ogg"
    }
  ],
  "word": "have one's back up"
}

{
  "forms": [
    {
      "form": "has one's back up",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "having one's back up",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "had one's back up",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "had one's back up",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "have<has,,had> one's back up"
      },
      "expansion": "have one's back up (third-person singular simple present has one's back up, present participle having one's back up, simple past and past participle had one's back up)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "related": [
    {
      "word": "put someone's back up"
    },
    {
      "word": "raise someone's hackles"
    },
    {
      "word": "ruffle some feathers"
    },
    {
      "word": "get someone's back up"
    }
  ],
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English idioms",
        "English lemmas",
        "English multiword terms",
        "English terms with usage examples",
        "English verbs",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "text": "He's had his back up all morning. There's no point in trying to talk to him.",
          "type": "example"
        }
      ],
      "glosses": [
        "To be angry or defensive."
      ],
      "links": [
        [
          "angry",
          "angry"
        ],
        [
          "defensive",
          "defensive"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) To be angry or defensive."
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-au-have one's back up.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/6/6c/En-au-have_one%27s_back_up.ogg/En-au-have_one%27s_back_up.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/6/6c/En-au-have_one%27s_back_up.ogg"
    }
  ],
  "synonyms": [
    {
      "word": "get one's dander up"
    },
    {
      "word": "get one's Irish up"
    }
  ],
  "word": "have one's back up"
}