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third force
third man
third market (1)
third market (2)
third party
third person
third-person
third position
third rail
third-rate
third reading
Third Reich
Third Republic
third-stream
third string
third team
third umpire
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third rail

third rail (plural third rails)


noun 
Definition:
 
1. rail for electric train: a rail from which some electrically powered trains pick up current

2. controversial or dangerous issue: an issue or situation that is highly charged, fraught with controversy, or dangerous to deal with
tax hikes as a third rail in U.S. politics

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