"self-harmer" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "self-",
        "3": "harmer"
      },
      "expansion": "self- + harmer",
      "name": "af"
    },
    {
      "args": {
        "1": "en",
        "2": "self-harm",
        "3": "-er",
        "id2": "agent noun"
      },
      "expansion": "self-harm + -er",
      "name": "af"
    }
  ],
  "etymology_text": "From self- + harmer or self-harm + -er.",
  "forms": [
    {
      "form": "self-harmers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "self-harmer (plural self-harmers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "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 terms prefixed with self-",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms suffixed with -er (agent noun)",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Someone who performs self-harm."
      ],
      "id": "en-self-harmer-en-noun-c4nNC9uy",
      "links": [
        [
          "self-harm",
          "self-harm"
        ]
      ]
    }
  ],
  "word": "self-harmer"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "self-",
        "3": "harmer"
      },
      "expansion": "self- + harmer",
      "name": "af"
    },
    {
      "args": {
        "1": "en",
        "2": "self-harm",
        "3": "-er",
        "id2": "agent noun"
      },
      "expansion": "self-harm + -er",
      "name": "af"
    }
  ],
  "etymology_text": "From self- + harmer or self-harm + -er.",
  "forms": [
    {
      "form": "self-harmers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "self-harmer (plural self-harmers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms prefixed with self-",
        "English terms suffixed with -er (agent noun)",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "Someone who performs self-harm."
      ],
      "links": [
        [
          "self-harm",
          "self-harm"
        ]
      ]
    }
  ],
  "word": "self-harmer"
}