"水面下" meaning in Japanese

{
  "forms": [
    {
      "form": "水面下",
      "ruby": [
        [
          "水",
          "すい"
        ],
        [
          "面",
          "めん"
        ],
        [
          "下",
          "か"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "suimenka",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "すいめんか",
      "roman": "suimenka",
      "tags": [
        "hiragana",
        "historical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "すいめんか",
        "hhira": "すいめんか"
      },
      "expansion": "水(すい)面(めん)下(か) • (suimenka) ^(←すいめんか (suimenka)?)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "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 alt parameters",
          "parents": [
            "Links with redundant alt parameters",
            "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 redundant sortkeys",
          "parents": [
            "Terms with redundant sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "to advance plans covertly",
          "roman": "keikaku o suimenka de susumeru",
          "ruby": [
            [
              "計",
              "けい"
            ],
            [
              "画",
              "かく"
            ],
            [
              "水",
              "すい"
            ],
            [
              "面",
              "めん"
            ],
            [
              "下",
              "か"
            ],
            [
              "進",
              "すす"
            ]
          ],
          "text": "計画を水面下で進める"
        }
      ],
      "glosses": [
        "being under the table; being covert"
      ],
      "id": "en-水面下-ja-noun-UOo2lId2",
      "links": [
        [
          "under the table",
          "under the table"
        ],
        [
          "covert",
          "covert"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "other": "すいめんか"
    },
    {
      "ipa": "[sɨᵝimẽ̞ŋka̠]"
    }
  ],
  "word": "水面下"
}

{
  "forms": [
    {
      "form": "水面下",
      "ruby": [
        [
          "水",
          "すい"
        ],
        [
          "面",
          "めん"
        ],
        [
          "下",
          "か"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "suimenka",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "すいめんか",
      "roman": "suimenka",
      "tags": [
        "hiragana",
        "historical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "すいめんか",
        "hhira": "すいめんか"
      },
      "expansion": "水(すい)面(めん)下(か) • (suimenka) ^(←すいめんか (suimenka)?)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Japanese entries with incorrect language header",
        "Japanese lemmas",
        "Japanese links with redundant alt parameters",
        "Japanese links with redundant wikilinks",
        "Japanese nouns",
        "Japanese terms spelled with first grade kanji",
        "Japanese terms spelled with third grade kanji",
        "Japanese terms with IPA pronunciation",
        "Japanese terms with redundant sortkeys",
        "Japanese terms with usage examples",
        "Japanese terms written with three Han script characters"
      ],
      "examples": [
        {
          "english": "to advance plans covertly",
          "roman": "keikaku o suimenka de susumeru",
          "ruby": [
            [
              "計",
              "けい"
            ],
            [
              "画",
              "かく"
            ],
            [
              "水",
              "すい"
            ],
            [
              "面",
              "めん"
            ],
            [
              "下",
              "か"
            ],
            [
              "進",
              "すす"
            ]
          ],
          "text": "計画を水面下で進める"
        }
      ],
      "glosses": [
        "being under the table; being covert"
      ],
      "links": [
        [
          "under the table",
          "under the table"
        ],
        [
          "covert",
          "covert"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "other": "すいめんか"
    },
    {
      "ipa": "[sɨᵝimẽ̞ŋka̠]"
    }
  ],
  "word": "水面下"
}

{
  "called_from": "parser/304",
  "msg": "HTML tag <span> not properly closed",
  "path": [
    "水面下"
  ],
  "section": "Japanese",
  "subsection": "noun",
  "title": "水面下",
  "trace": "started on line 2, detected on line 2"
}

{
  "called_from": "parser/1336",
  "msg": "no corresponding start tag found for </span>",
  "path": [
    "水面下"
  ],
  "section": "Japanese",
  "subsection": "noun",
  "title": "水面下",
  "trace": ""
}