"bubble under" meaning in English

{
  "forms": [
    {
      "form": "bubbles under",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "bubbling under",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "bubbled under",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "bubbled under",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "bubble under (third-person singular simple present bubbles under, present participle bubbling under, simple past and past participle bubbled under)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English phrasal verbs with particle (under)",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1971, Billboard, volume 83, number 13, page 31",
          "text": "The record first happened a few years ago in Florida and had considerable sales. A year later, the record broke out again in Florida and again experienced considerable sales. Both times, it either made the chart or bubbled under.",
          "type": "quotation"
        },
        {
          "ref": "2015 November 25, The Independent",
          "text": "The new wave of green power is bubbling under in Swansea Bay.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "To be successful on a modest scale, without yet being fully established"
      ],
      "id": "en-bubble_under-en-verb-mW2hBh6~",
      "links": [
        [
          "successful",
          "successful"
        ],
        [
          "modest",
          "modest"
        ],
        [
          "scale",
          "scale"
        ],
        [
          "established",
          "established"
        ]
      ],
      "raw_glosses": [
        "(intransitive) To be successful on a modest scale, without yet being fully established"
      ],
      "tags": [
        "intransitive"
      ]
    }
  ],
  "word": "bubble under"
}

{
  "forms": [
    {
      "form": "bubbles under",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "bubbling under",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "bubbled under",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "bubbled under",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "bubble under (third-person singular simple present bubbles under, present participle bubbling under, simple past and past participle bubbled under)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English intransitive verbs",
        "English lemmas",
        "English multiword terms",
        "English phrasal verbs",
        "English phrasal verbs with particle (under)",
        "English terms with quotations",
        "English verbs"
      ],
      "examples": [
        {
          "ref": "1971, Billboard, volume 83, number 13, page 31",
          "text": "The record first happened a few years ago in Florida and had considerable sales. A year later, the record broke out again in Florida and again experienced considerable sales. Both times, it either made the chart or bubbled under.",
          "type": "quotation"
        },
        {
          "ref": "2015 November 25, The Independent",
          "text": "The new wave of green power is bubbling under in Swansea Bay.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "To be successful on a modest scale, without yet being fully established"
      ],
      "links": [
        [
          "successful",
          "successful"
        ],
        [
          "modest",
          "modest"
        ],
        [
          "scale",
          "scale"
        ],
        [
          "established",
          "established"
        ]
      ],
      "raw_glosses": [
        "(intransitive) To be successful on a modest scale, without yet being fully established"
      ],
      "tags": [
        "intransitive"
      ]
    }
  ],
  "word": "bubble under"
}