third rail

English

Noun

third rail (plural third rails)

  1. The electrified rail that runs beside or between train tracks to power electric trains.
  2. (by extension) anything that is dangerous to come into contact with, or is best avoided.
    • 2014 March 29, Stephen Sestanovich, “Putin's reckless gamble”, in The New York Times‎:
      Despite ethnic resentment and suspicion, they [Ukraine's leaders] never contemplated breaking up the country. This was the third rail of Ukranian politics, and very few were willing to touch it. Secession was taboo.

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