"瓜に爪あり爪に爪なし" meaning in Japanese

{
  "forms": [
    {
      "form": "瓜に爪あり爪に爪なし",
      "ruby": [
        [
          "瓜",
          "うり"
        ],
        [
          "爪",
          "つめ"
        ],
        [
          "爪",
          "つめ"
        ],
        [
          "爪",
          "つめ"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "uri ni tsume ari tsume ni tsume nashi",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "うり に つめ あり つめ に つめ なし"
      },
      "expansion": "瓜(うり)に爪(つめ)あり爪(つめ)に爪(つめ)なし • (uri ni tsume ari tsume ni tsume nashi)",
      "name": "ja-phrase"
    }
  ],
  "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 mnemonics",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms making reference to character shapes",
          "parents": [
            "Terms making reference to character shapes",
            "Terms by etymology"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with 4 kanji",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with redundant sortkeys",
          "parents": [
            "Terms with redundant sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "There is a claw in 瓜 (“melon”) but no claw in 爪 (“claw”): A phrase explaining the difference between the characters 瓜 (“melon”) and 爪 (“claw”)."
      ],
      "id": "en-瓜に爪あり爪に爪なし-ja-phrase-8NLY77Jp",
      "links": [
        [
          "瓜",
          "瓜#Japanese"
        ],
        [
          "爪",
          "爪#Japanese"
        ]
      ],
      "synonyms": [
        {
          "roman": "tsume ni tsume naku uri ni tsume ari",
          "ruby": [
            [
              "爪",
              "つめ"
            ],
            [
              "爪",
              "つめ"
            ],
            [
              "瓜",
              "うり"
            ],
            [
              "爪",
              "つめ"
            ]
          ],
          "word": "爪に爪なく瓜に爪あり"
        }
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ɯ̟ɾʲi ɲ̟i t͡sɨme̞ a̠ɾʲi t͡sɨme̞ ɲ̟i t͡sɨme̞ na̠ɕi]"
    }
  ],
  "word": "瓜に爪あり爪に爪なし"
}

{
  "forms": [
    {
      "form": "瓜に爪あり爪に爪なし",
      "ruby": [
        [
          "瓜",
          "うり"
        ],
        [
          "爪",
          "つめ"
        ],
        [
          "爪",
          "つめ"
        ],
        [
          "爪",
          "つめ"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "uri ni tsume ari tsume ni tsume nashi",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "うり に つめ あり つめ に つめ なし"
      },
      "expansion": "瓜(うり)に爪(つめ)あり爪(つめ)に爪(つめ)なし • (uri ni tsume ari tsume ni tsume nashi)",
      "name": "ja-phrase"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        "Japanese entries with incorrect language header",
        "Japanese lemmas",
        "Japanese links with redundant wikilinks",
        "Japanese mnemonics",
        "Japanese phrases",
        "Japanese terms making reference to character shapes",
        "Japanese terms spelled with jinmeiyō kanji",
        "Japanese terms spelled with secondary school kanji",
        "Japanese terms with 4 kanji",
        "Japanese terms with IPA pronunciation",
        "Japanese terms with IPA pronunciation missing pitch accent",
        "Japanese terms with redundant sortkeys",
        "Pages with 1 entry"
      ],
      "glosses": [
        "There is a claw in 瓜 (“melon”) but no claw in 爪 (“claw”): A phrase explaining the difference between the characters 瓜 (“melon”) and 爪 (“claw”)."
      ],
      "links": [
        [
          "瓜",
          "瓜#Japanese"
        ],
        [
          "爪",
          "爪#Japanese"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ɯ̟ɾʲi ɲ̟i t͡sɨme̞ a̠ɾʲi t͡sɨme̞ ɲ̟i t͡sɨme̞ na̠ɕi]"
    }
  ],
  "synonyms": [
    {
      "roman": "tsume ni tsume naku uri ni tsume ari",
      "ruby": [
        [
          "爪",
          "つめ"
        ],
        [
          "爪",
          "つめ"
        ],
        [
          "瓜",
          "うり"
        ],
        [
          "爪",
          "つめ"
        ]
      ],
      "word": "爪に爪なく瓜に爪あり"
    }
  ],
  "word": "瓜に爪あり爪に爪なし"
}

{
  "called_from": "parser/1336",
  "msg": "no corresponding start tag found for </span>",
  "path": [
    "瓜に爪あり爪に爪なし"
  ],
  "section": "Japanese",
  "subsection": "phrase",
  "title": "瓜に爪あり爪に爪なし",
  "trace": ""
}