Meaning : A street with only one way in or out.
Synonyms : cul de sac, dead-end street, impasse
Meaning : (figurative) a course of action that is unproductive and offers no hope of improvement.
Example :
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.
Blind alley ka meaning, vilom shabd, paryayvachi aur samanarthi shabd in Marathi. Blind alley ka matlab kya hota hai?