"heartstopper" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "heart",
        "3": "stopper"
      },
      "expansion": "heart + stopper",
      "name": "compound"
    }
  ],
  "etymology_text": "heart + stopper",
  "forms": [
    {
      "form": "heartstoppers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "heartstopper (plural heartstoppers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2007 July 13, The New York Times, “Pop and Rock Listings”, in New York Times",
          "text": "One, “I Just Don’t Think I’ll Ever Get Over You,” was a heartstopper in the film “Garden State.”",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Something highly exciting."
      ],
      "id": "en-heartstopper-en-noun-nIugmq4b",
      "links": [
        [
          "exciting",
          "exciting"
        ]
      ],
      "raw_glosses": [
        "(informal) Something highly exciting."
      ],
      "tags": [
        "informal"
      ]
    }
  ],
  "word": "heartstopper"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "heart",
        "3": "stopper"
      },
      "expansion": "heart + stopper",
      "name": "compound"
    }
  ],
  "etymology_text": "heart + stopper",
  "forms": [
    {
      "form": "heartstoppers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "heartstopper (plural heartstoppers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English compound terms",
        "English countable nouns",
        "English entries with incorrect language header",
        "English informal terms",
        "English lemmas",
        "English nouns",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "2007 July 13, The New York Times, “Pop and Rock Listings”, in New York Times",
          "text": "One, “I Just Don’t Think I’ll Ever Get Over You,” was a heartstopper in the film “Garden State.”",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Something highly exciting."
      ],
      "links": [
        [
          "exciting",
          "exciting"
        ]
      ],
      "raw_glosses": [
        "(informal) Something highly exciting."
      ],
      "tags": [
        "informal"
      ]
    }
  ],
  "word": "heartstopper"
}