a street with only one way in or out
(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"
- The blind alley ended in a stone wall.
- The maze was very difficult with many blind paths and dead ends.
- When he invested in that business,he went up a blind alley.
- John did not take the job because it was a blind alley.