1. blind alley, cul de sac, dead-end street, impasse, thoroughfare

usage: a street with only one way in or out

2. blind alley, course, course of action

usage: (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"

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