"rear up" meaning in English

{
  "etymology_text": "* rear + up",
  "forms": [
    {
      "form": "rears up",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "rearing up",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "reared up",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "reared up",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "rear up (third-person singular simple present rears up, present participle rearing up, simple past and past participle reared 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": "Entries with translation boxes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with German translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Maori translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Swedish translations",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "[1877], Anna Sewell, “A Strike for Liberty”, in Black Beauty: […], London: Jarrold and Sons, […], →OCLC, part II, page 106:",
          "text": "She had a good idea of what was coming, and the moment York took the rein off the terret in order to shorten it, she took her opportunity, and reared up so suddenly, that York had his nose roughly hit, and his hat knocked off; […]",
          "type": "quote"
        }
      ],
      "glosses": [
        "To rise up, especially an animal like a horse rising up on its rear legs."
      ],
      "id": "en-rear_up-en-verb-ZY5a~7kv",
      "links": [
        [
          "rise",
          "rise"
        ]
      ],
      "translations": [
        {
          "code": "de",
          "lang": "German",
          "sense": "to rise up on the hind legs - usually referring to a horse",
          "word": "sich aufbäumen"
        },
        {
          "code": "mi",
          "lang": "Maori",
          "sense": "to rise up on the hind legs - usually referring to a horse",
          "word": "tānapu"
        },
        {
          "code": "sv",
          "lang": "Swedish",
          "sense": "to rise up on the hind legs - usually referring to a horse",
          "word": "stegra sig"
        }
      ]
    }
  ],
  "word": "rear up"
}

{
  "etymology_text": "* rear + up",
  "forms": [
    {
      "form": "rears up",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "rearing up",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "reared up",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "reared up",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "rear up (third-person singular simple present rears up, present participle rearing up, simple past and past participle reared up)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English phrasal verbs",
        "English phrasal verbs formed with \"up\"",
        "English terms with quotations",
        "English verbs",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with German translations",
        "Terms with Maori translations",
        "Terms with Swedish translations"
      ],
      "examples": [
        {
          "ref": "[1877], Anna Sewell, “A Strike for Liberty”, in Black Beauty: […], London: Jarrold and Sons, […], →OCLC, part II, page 106:",
          "text": "She had a good idea of what was coming, and the moment York took the rein off the terret in order to shorten it, she took her opportunity, and reared up so suddenly, that York had his nose roughly hit, and his hat knocked off; […]",
          "type": "quote"
        }
      ],
      "glosses": [
        "To rise up, especially an animal like a horse rising up on its rear legs."
      ],
      "links": [
        [
          "rise",
          "rise"
        ]
      ]
    }
  ],
  "translations": [
    {
      "code": "de",
      "lang": "German",
      "sense": "to rise up on the hind legs - usually referring to a horse",
      "word": "sich aufbäumen"
    },
    {
      "code": "mi",
      "lang": "Maori",
      "sense": "to rise up on the hind legs - usually referring to a horse",
      "word": "tānapu"
    },
    {
      "code": "sv",
      "lang": "Swedish",
      "sense": "to rise up on the hind legs - usually referring to a horse",
      "word": "stegra sig"
    }
  ],
  "word": "rear up"
}