Meaning of swamp gas | Babel Free

Definitions

1. Gases emitted from a swamp.
   literally, uncountable
2. Hydrogen sulfide.
   colloquial, uncountable
3. A skeptical explanation that is provided in order to debunk a UFO sighting that a believer regards as ludicrous, illogical or disingenuous.
   sarcastic, uncountable

Examples

“Swamp gas occasionally catches fire. Sometimes lightning sets off a patch of swamp gas.”

“He explained away an especially peculiar sighting with another helping of good old swamp gas.”

CEFR level