Usually means: Dangerous, untouchable topic or issue.
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We found 18 dictionaries that define the word third rail:

General (15 matching dictionaries)
  1. third rail: Merriam-Webster
  2. third rail: Oxford Learner's Dictionaries
  3. third rail: American Heritage Dictionary of the English Language
  4. third rail: Collins English Dictionary
  5. third rail: Vocabulary.com
  6. third-rail, third rail: Wordnik
  7. third rail: Wiktionary
  8. third rail: The Wordsmyth English Dictionary-Thesaurus
  9. third rail: Infoplease Dictionary
  10. third rail: Dictionary.com
  11. The Third Rail (band), The Third Rail, Third Rail (song), Third Rail, Third-rail, Third rail (disambiguation), Third rail (metaphor), Third rail (model rail), Third rail (model railroading), Third rail: Wikipedia, the Free Encyclopedia
  12. third rail: Rhymezone
  13. third rail: FreeDictionary.org
  14. third rail: Mnemonic Dictionary
  15. third rail: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. Third-rail, third rail: Encyclopedia

Slang (2 matching dictionaries)
  1. third rail, third rail: Green’s Dictionary of Slang
  2. third rail: Urban Dictionary

(Note: See third_rails as well.)

Definitions from Wiktionary (third rail)

noun:  The electrified rail that runs beside or between train tracks to power electric trains.
noun:  (by extension) Anything that is dangerous to come into contact with, or is best avoided.

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