"day job" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "day",
        "3": "job"
      },
      "expansion": "day + job",
      "name": "compound"
    }
  ],
  "etymology_text": "From day + job.",
  "forms": [
    {
      "form": "day jobs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "day job (plural day jobs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English endocentric compounds",
          "parents": [
            "Endocentric compounds",
            "Compound terms",
            "Terms by etymology"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "don't give up your day job"
        }
      ],
      "glosses": [
        "One's principal job; one's regular means of income."
      ],
      "id": "en-day_job-en-noun-Pgw-rqnG",
      "links": [
        [
          "principal",
          "principal"
        ],
        [
          "means",
          "means"
        ],
        [
          "income",
          "income"
        ]
      ],
      "related": [
        {
          "word": "9 to 5"
        },
        {
          "word": "moonlighting"
        }
      ],
      "synonyms": [
        {
          "word": "dayjob"
        }
      ]
    }
  ],
  "word": "day job"
}

{
  "derived": [
    {
      "word": "don't give up your day job"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "day",
        "3": "job"
      },
      "expansion": "day + job",
      "name": "compound"
    }
  ],
  "etymology_text": "From day + job.",
  "forms": [
    {
      "form": "day jobs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "day job (plural day jobs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "9 to 5"
    },
    {
      "word": "moonlighting"
    }
  ],
  "senses": [
    {
      "categories": [
        "English compound terms",
        "English countable nouns",
        "English endocentric compounds",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "One's principal job; one's regular means of income."
      ],
      "links": [
        [
          "principal",
          "principal"
        ],
        [
          "means",
          "means"
        ],
        [
          "income",
          "income"
        ]
      ]
    }
  ],
  "synonyms": [
    {
      "word": "dayjob"
    }
  ],
  "word": "day job"
}

{
  "called_from": "form_descriptions/1089",
  "msg": "suspicious unhandled suffix in English: '9 to 5', originally '9 to 5'",
  "path": [
    "day job"
  ],
  "section": "English",
  "subsection": "noun",
  "title": "day job",
  "trace": ""
}