blind alley

Noun
  1. A street with only one way in or out (synset 102854799)
    is a type of: thoroughfare - a public road from one place to another
    same as: cul de sac, dead-end street, impasse
  2. (figurative) a course of action that is unproductive and offers no hope of improvement (synset 100039311)
    "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"
    domain usage: figure, figure of speech, image, trope - language used in a figurative or nonliteral sense
    is a type of: course, course of action - a mode of action

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