"swamp gas" meaning in English

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  "etymology_text": "* (hydrogen sulfide): So called because it is often emitted from wetlands such as swamps as a result of anaerobic bacteria, and is responsible for their foul “rotten egg” odor.\n* (ufology): An explanation given by then-skeptic J. Allen Hynek for an alleged UFO sighting in Michigan near Lake Huron in 1966.",
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  "lang_code": "en",
  "pos": "noun",
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        {
          "_dis": "56 26 18",
          "kind": "topical",
          "langcode": "en",
          "name": "Sulfur",
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      "glosses": [
        "Gases emitted from a swamp."
      ],
      "id": "en-swamp_gas-en-noun-Q8V1o2S6",
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          "swamp",
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      "raw_glosses": [
        "(literally) Gases emitted from a swamp."
      ],
      "synonyms": [
        {
          "word": "bog gas"
        },
        {
          "word": "marsh gas"
        },
        {
          "word": "biogas"
        }
      ],
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        "literally",
        "uncountable"
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      "glosses": [
        "Hydrogen sulfide."
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        "(inorganic chemistry, colloquial) Hydrogen sulfide."
      ],
      "synonyms": [
        {
          "word": "rotten egg gas"
        }
      ],
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        "colloquial",
        "uncountable"
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        "chemistry",
        "inorganic-chemistry",
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          "name": "Ufology",
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        "(ufology, sarcastic) A skeptical explanation that is provided in order to debunk a UFO sighting that a believer regards as ludicrous, illogical or disingenuous."
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          "word": "weather balloon"
        },
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          "word": "pelican"
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  "word": "swamp gas"
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  "etymology_text": "* (hydrogen sulfide): So called because it is often emitted from wetlands such as swamps as a result of anaerobic bacteria, and is responsible for their foul “rotten egg” odor.\n* (ufology): An explanation given by then-skeptic J. Allen Hynek for an alleged UFO sighting in Michigan near Lake Huron in 1966.",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "Gases emitted from a swamp."
      ],
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          "swamp",
          "swamp"
        ]
      ],
      "raw_glosses": [
        "(literally) Gases emitted from a swamp."
      ],
      "synonyms": [
        {
          "word": "bog gas"
        },
        {
          "word": "marsh gas"
        },
        {
          "word": "biogas"
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        "(inorganic chemistry, colloquial) Hydrogen sulfide."
      ],
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        {
          "word": "rotten egg gas"
        }
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        "(ufology, sarcastic) A skeptical explanation that is provided in order to debunk a UFO sighting that a believer regards as ludicrous, illogical or disingenuous."
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  "word": "swamp gas"
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