Blind alley Meaning, Definition & Usage

  1. noun a street with only one way in or out
    impasse; dead-end street; cul de sac.
  2. noun (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

WordNet

Definitions
  1. an alley closed at one end; a cul-de-sac.

Webster 1913