"craic killer" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "ine-pro",
        "3": "*gerh₂-"
      },
      "expansion": "",
      "name": "root"
    },
    {
      "args": {
        "1": "en",
        "2": "ga",
        "3": "craic"
      },
      "expansion": "Irish craic",
      "name": "bor"
    },
    {
      "args": {
        "1": "en",
        "2": "en",
        "3": "crack"
      },
      "expansion": "English crack",
      "name": "der"
    },
    {
      "args": {
        "1": "en",
        "2": "enm",
        "3": "crak",
        "t": "loud conversation, bragging talk"
      },
      "expansion": "Middle English crak (“loud conversation, bragging talk”)",
      "name": "der"
    }
  ],
  "etymology_text": "Borrowed from Irish craic, itself borrowed from Northern English crack, inherited from Middle English crak (“loud conversation, bragging talk”).",
  "forms": [
    {
      "form": "craic killers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "craic killer (plural craic killers)",
      "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"
        },
        {
          "kind": "other",
          "name": "English terms borrowed back into English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Irish English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Northern England English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "People",
          "orig": "en:People",
          "parents": [
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Personality",
          "orig": "en:Personality",
          "parents": [
            "Mind",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Something or someone that spoils an otherwise enjoyable event."
      ],
      "id": "en-craic_killer-en-noun-WjcCJe-l",
      "raw_glosses": [
        "(Ireland, Northern England) Something or someone that spoils an otherwise enjoyable event."
      ],
      "synonyms": [
        {
          "sense": "something or someone who spoils an enjoyable event",
          "word": "dampener"
        },
        {
          "word": "buzzkill"
        },
        {
          "word": "killjoy"
        },
        {
          "word": "wet blanket"
        },
        {
          "tags": [
            "person"
          ],
          "word": "party-pooper"
        },
        {
          "word": "spoilsport"
        }
      ],
      "tags": [
        "Ireland",
        "Northern-England"
      ]
    }
  ],
  "word": "craic killer"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "ine-pro",
        "3": "*gerh₂-"
      },
      "expansion": "",
      "name": "root"
    },
    {
      "args": {
        "1": "en",
        "2": "ga",
        "3": "craic"
      },
      "expansion": "Irish craic",
      "name": "bor"
    },
    {
      "args": {
        "1": "en",
        "2": "en",
        "3": "crack"
      },
      "expansion": "English crack",
      "name": "der"
    },
    {
      "args": {
        "1": "en",
        "2": "enm",
        "3": "crak",
        "t": "loud conversation, bragging talk"
      },
      "expansion": "Middle English crak (“loud conversation, bragging talk”)",
      "name": "der"
    }
  ],
  "etymology_text": "Borrowed from Irish craic, itself borrowed from Northern English crack, inherited from Middle English crak (“loud conversation, bragging talk”).",
  "forms": [
    {
      "form": "craic killers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "craic killer (plural craic killers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms borrowed back into English",
        "English terms borrowed from Irish",
        "English terms derived from Irish",
        "English terms derived from Middle English",
        "English terms derived from Proto-Indo-European",
        "English terms derived from the Proto-Indo-European root *gerh₂-",
        "Irish English",
        "Northern England English",
        "Pages with 1 entry",
        "Pages with entries",
        "en:People",
        "en:Personality"
      ],
      "glosses": [
        "Something or someone that spoils an otherwise enjoyable event."
      ],
      "raw_glosses": [
        "(Ireland, Northern England) Something or someone that spoils an otherwise enjoyable event."
      ],
      "tags": [
        "Ireland",
        "Northern-England"
      ]
    }
  ],
  "synonyms": [
    {
      "sense": "something or someone who spoils an enjoyable event",
      "word": "dampener"
    },
    {
      "word": "buzzkill"
    },
    {
      "word": "killjoy"
    },
    {
      "word": "wet blanket"
    },
    {
      "tags": [
        "person"
      ],
      "word": "party-pooper"
    },
    {
      "word": "spoilsport"
    }
  ],
  "word": "craic killer"
}