"underrater" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "underrate",
        "3": "er"
      },
      "expansion": "underrate + -er",
      "name": "suffix"
    }
  ],
  "etymology_text": "underrate + -er",
  "forms": [
    {
      "form": "underraters",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "underrater (plural underraters)",
      "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 suffixed with -er",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2012, Dale H. Schunk, Student Perceptions in the Classroom",
          "text": "Extreme underraters should show a lower level of achievement and engagement than do accurate perceivers, but not necessarily lower than moderate underraters.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "One who gives too low a rating."
      ],
      "id": "en-underrater-en-noun-cozzOk07",
      "links": [
        [
          "rating",
          "rating"
        ]
      ]
    }
  ],
  "word": "underrater"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "underrate",
        "3": "er"
      },
      "expansion": "underrate + -er",
      "name": "suffix"
    }
  ],
  "etymology_text": "underrate + -er",
  "forms": [
    {
      "form": "underraters",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "underrater (plural underraters)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms suffixed with -er",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "2012, Dale H. Schunk, Student Perceptions in the Classroom",
          "text": "Extreme underraters should show a lower level of achievement and engagement than do accurate perceivers, but not necessarily lower than moderate underraters.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "One who gives too low a rating."
      ],
      "links": [
        [
          "rating",
          "rating"
        ]
      ]
    }
  ],
  "word": "underrater"
}