"grade sixer" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "grade six",
        "3": "er"
      },
      "expansion": "grade six + -er",
      "name": "suf"
    }
  ],
  "etymology_text": "grade six + -er",
  "forms": [
    {
      "form": "grade sixers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "grade sixer (plural grade sixers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Canadian English",
          "parents": [],
          "source": "w"
        },
        {
          "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"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "People",
          "orig": "en:People",
          "parents": [
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "coordinate_terms": [
        {
          "word": "grade oner"
        },
        {
          "word": "grade twoer"
        },
        {
          "word": "grade three-er"
        },
        {
          "word": "grade fourer"
        },
        {
          "word": "grade fiver"
        },
        {
          "word": "grade sevener"
        },
        {
          "word": "grade eighter"
        },
        {
          "word": "grade niner"
        },
        {
          "word": "grade tener"
        },
        {
          "word": "grade elevener"
        },
        {
          "word": "grade twelver"
        },
        {
          "word": "grade thirteener"
        }
      ],
      "glosses": [
        "Synonym of sixth grader"
      ],
      "id": "en-grade_sixer-en-noun-a9L6IFLe",
      "links": [
        [
          "sixth grader",
          "sixth grader#English"
        ]
      ],
      "raw_glosses": [
        "(Canada) Synonym of sixth grader"
      ],
      "related": [
        {
          "word": "grade six"
        },
        {
          "word": "grade 6"
        },
        {
          "word": "sixth grade"
        }
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "sixth grader"
        }
      ],
      "tags": [
        "Canada"
      ]
    }
  ],
  "word": "grade sixer"
}

{
  "coordinate_terms": [
    {
      "word": "grade oner"
    },
    {
      "word": "grade twoer"
    },
    {
      "word": "grade three-er"
    },
    {
      "word": "grade fourer"
    },
    {
      "word": "grade fiver"
    },
    {
      "word": "grade sevener"
    },
    {
      "word": "grade eighter"
    },
    {
      "word": "grade niner"
    },
    {
      "word": "grade tener"
    },
    {
      "word": "grade elevener"
    },
    {
      "word": "grade twelver"
    },
    {
      "word": "grade thirteener"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "grade six",
        "3": "er"
      },
      "expansion": "grade six + -er",
      "name": "suf"
    }
  ],
  "etymology_text": "grade six + -er",
  "forms": [
    {
      "form": "grade sixers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "grade sixer (plural grade sixers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "grade six"
    },
    {
      "word": "grade 6"
    },
    {
      "word": "sixth grade"
    }
  ],
  "senses": [
    {
      "categories": [
        "Canadian English",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms suffixed with -er",
        "en:People"
      ],
      "glosses": [
        "Synonym of sixth grader"
      ],
      "links": [
        [
          "sixth grader",
          "sixth grader#English"
        ]
      ],
      "raw_glosses": [
        "(Canada) Synonym of sixth grader"
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "sixth grader"
        }
      ],
      "tags": [
        "Canada"
      ]
    }
  ],
  "word": "grade sixer"
}

{
  "called_from": "form_descriptions/1089",
  "msg": "suspicious unhandled suffix in English: 'grade 6', originally 'grade 6'",
  "path": [
    "grade sixer"
  ],
  "section": "English",
  "subsection": "noun",
  "title": "grade sixer",
  "trace": ""
}