- blind alley, cul de sac, dead-end street, impasse - a street with only one way in or out
--1 is a kind of thoroughfare
- blind alley - (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"
--2 is a kind of course, course of action