"rearer" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "rear",
        "3": "-er",
        "id2": "agent noun"
      },
      "expansion": "rear + -er",
      "name": "affix"
    }
  ],
  "etymology_text": "rear + -er",
  "forms": [
    {
      "form": "rearers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "rearer (plural rearers)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "One who rears (nurtures children or animals)."
      ],
      "id": "en-rearer-en-noun-W9YRDatz",
      "links": [
        [
          "rears",
          "rear#Verb"
        ]
      ]
    },
    {
      "categories": [
        {
          "_dis": "26 74",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w+disamb"
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        {
          "_dis": "31 69",
          "kind": "other",
          "name": "English terms suffixed with -er (agent noun)",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "A horse or other animal that rears up."
      ],
      "id": "en-rearer-en-noun-YYgjpzSS"
    }
  ],
  "word": "rearer"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English nouns",
    "English terms suffixed with -er (agent noun)"
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "rear",
        "3": "-er",
        "id2": "agent noun"
      },
      "expansion": "rear + -er",
      "name": "affix"
    }
  ],
  "etymology_text": "rear + -er",
  "forms": [
    {
      "form": "rearers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "rearer (plural rearers)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "One who rears (nurtures children or animals)."
      ],
      "links": [
        [
          "rears",
          "rear#Verb"
        ]
      ]
    },
    {
      "glosses": [
        "A horse or other animal that rears up."
      ]
    }
  ],
  "word": "rearer"
}