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Noun: blind alley  blInd a-lee
  1. A street with only one way in or out
    - cul de sac, dead-end street, impasse
  2. (figurative) a course of action that is unproductive and offers no hope of improvement
    "all the clues led the police into blind alleys"; "so far every road that we've been down has turned out to be a blind alley"

Derived forms: blind alleys

Type of: course, course of action, thoroughfare

Encyclopedia: Blind alley