"減るもんじゃない" meaning in Japanese

{
  "etymology_templates": [
    {
      "args": {
        "1": "ja",
        "2": "減る",
        "3": "もん",
        "4": "じゃない"
      },
      "expansion": "減る + もん + じゃない",
      "name": "com"
    }
  ],
  "etymology_text": "減る + もん + じゃない, literally \"It would not get fewer/less/smaller (even if you do that)\"",
  "forms": [
    {
      "form": "減るもんじゃない",
      "ruby": [
        [
          "減",
          "へ"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "heru mon ja nai",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "phrase",
        "2": "へる もん じゃ ない"
      },
      "expansion": "減(へ)るもんじゃない • (heru mon ja nai)",
      "name": "ja-pos"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Japanese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with 1 kanji",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with multiple readings",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "it's no big deal, it's not the end of the world (if you do it)"
      ],
      "id": "en-減るもんじゃない-ja-phrase-Rx7HPmmd",
      "links": [
        [
          "not the end of the world",
          "not the end of the world"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) it's no big deal, it's not the end of the world (if you do it)"
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "word": "減るもんじゃない"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "ja",
        "2": "減る",
        "3": "もん",
        "4": "じゃない"
      },
      "expansion": "減る + もん + じゃない",
      "name": "com"
    }
  ],
  "etymology_text": "減る + もん + じゃない, literally \"It would not get fewer/less/smaller (even if you do that)\"",
  "forms": [
    {
      "form": "減るもんじゃない",
      "ruby": [
        [
          "減",
          "へ"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "heru mon ja nai",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "phrase",
        "2": "へる もん じゃ ない"
      },
      "expansion": "減(へ)るもんじゃない • (heru mon ja nai)",
      "name": "ja-pos"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        "Japanese compound terms",
        "Japanese entries with incorrect language header",
        "Japanese idioms",
        "Japanese lemmas",
        "Japanese links with redundant wikilinks",
        "Japanese phrases",
        "Japanese terms spelled with fifth grade kanji",
        "Japanese terms spelled with じゃ",
        "Japanese terms with 1 kanji",
        "Japanese terms with multiple readings",
        "Japanese terms with non-redundant non-automated sortkeys",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "it's no big deal, it's not the end of the world (if you do it)"
      ],
      "links": [
        [
          "not the end of the world",
          "not the end of the world"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) it's no big deal, it's not the end of the world (if you do it)"
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "word": "減るもんじゃない"
}

{
  "called_from": "parser/1336",
  "msg": "no corresponding start tag found for </span>",
  "path": [
    "減るもんじゃない"
  ],
  "section": "Japanese",
  "subsection": "phrase",
  "title": "減るもんじゃない",
  "trace": ""
}