cul-de-sac - definition and synonyms

noun [countable] 

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/ˈkʌl də ˌsæk/
  1. 1
    a short street closed at one end, so that traffic cannot pass through it
  2. 2
    a situation in which you can make no more progress or from which you cannot escape

    The government has backed itself into another ideological cul-de-sac.