"killer" meaning in English

{
  "forms": [
    {
      "form": "killer",
      "tags": [
        "singular"
      ]
    },
    {
      "form": "killers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "expansion": "[POS TABLE]",
      "name": "noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "examples": [
        {
          "text": "The police caught the killer today."
        },
        {
          "text": "She was happy that her brother's killer was caught."
        }
      ],
      "glosses": [
        "Someone who kills. Usually this mean someone who kills other people, and does not have a good reason to kill."
      ],
      "id": "simple-killer-en-noun-QI1r308s"
    },
    {
      "examples": [
        {
          "text": "Lighting can be a real killer."
        }
      ],
      "glosses": [
        "Something that kills."
      ],
      "id": "simple-killer-en-noun-EEbbL07N"
    },
    {
      "examples": [
        {
          "text": "Failing the exam was a real killer."
        }
      ],
      "glosses": [
        "Something that cause problems."
      ],
      "id": "simple-killer-en-noun-ihTcgh3z"
    },
    {
      "categories": [
        {
          "kind": "other",
          "name": "Slang",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "The show was great, a real killer."
        }
      ],
      "glosses": [
        "Something that is very exciting."
      ],
      "id": "simple-killer-en-noun-a4hqOPjW",
      "raw_tags": [
        "slang"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-us-killer.ogg",
      "raw_tags": [
        "Audio"
      ],
      "tags": [
        "US"
      ]
    }
  ],
  "word": "killer"
}

{
  "forms": [
    {
      "form": "killer",
      "tags": [
        "positive"
      ]
    },
    {
      "form": "–",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "–",
      "tags": [
        "superlative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "killer",
        "2": "none",
        "3": "none"
      },
      "expansion": "[POS TABLE]",
      "name": "adjective"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "examples": [
        {
          "text": "Watch out! There are killer bees!"
        },
        {
          "text": "The family barely got away from the killer storm."
        }
      ],
      "glosses": [
        "If something is killer it kills."
      ],
      "id": "simple-killer-en-adj-DrtCQBhe"
    },
    {
      "categories": [
        {
          "kind": "other",
          "name": "Slang",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "That was a killer show!"
        }
      ],
      "glosses": [
        "If something is killer it is very good."
      ],
      "id": "simple-killer-en-adj-MX0com3-",
      "raw_tags": [
        "slang"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-us-killer.ogg",
      "raw_tags": [
        "Audio"
      ],
      "tags": [
        "US"
      ]
    }
  ],
  "word": "killer"
}

{
  "forms": [
    {
      "form": "killer",
      "tags": [
        "singular"
      ]
    },
    {
      "form": "killers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "expansion": "[POS TABLE]",
      "name": "noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "examples": [
        {
          "text": "The police caught the killer today."
        },
        {
          "text": "She was happy that her brother's killer was caught."
        }
      ],
      "glosses": [
        "Someone who kills. Usually this mean someone who kills other people, and does not have a good reason to kill."
      ]
    },
    {
      "examples": [
        {
          "text": "Lighting can be a real killer."
        }
      ],
      "glosses": [
        "Something that kills."
      ]
    },
    {
      "examples": [
        {
          "text": "Failing the exam was a real killer."
        }
      ],
      "glosses": [
        "Something that cause problems."
      ]
    },
    {
      "categories": [
        "Slang"
      ],
      "examples": [
        {
          "text": "The show was great, a real killer."
        }
      ],
      "glosses": [
        "Something that is very exciting."
      ],
      "raw_tags": [
        "slang"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-us-killer.ogg",
      "raw_tags": [
        "Audio"
      ],
      "tags": [
        "US"
      ]
    }
  ],
  "word": "killer"
}

{
  "forms": [
    {
      "form": "killer",
      "tags": [
        "positive"
      ]
    },
    {
      "form": "–",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "–",
      "tags": [
        "superlative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "killer",
        "2": "none",
        "3": "none"
      },
      "expansion": "[POS TABLE]",
      "name": "adjective"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "examples": [
        {
          "text": "Watch out! There are killer bees!"
        },
        {
          "text": "The family barely got away from the killer storm."
        }
      ],
      "glosses": [
        "If something is killer it kills."
      ]
    },
    {
      "categories": [
        "Slang"
      ],
      "examples": [
        {
          "text": "That was a killer show!"
        }
      ],
      "glosses": [
        "If something is killer it is very good."
      ],
      "raw_tags": [
        "slang"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-us-killer.ogg",
      "raw_tags": [
        "Audio"
      ],
      "tags": [
        "US"
      ]
    }
  ],
  "word": "killer"
}