blind alley - definition and synonyms

noun [countable] 

Your browser doesn’t support HTML5 audio

singularblind alley
pluralblind alleys
  1. 1
    a process that was expected to bring useful results but in fact achieves nothing

    This type of research turned out to be a blind alley.

  2. 2
    a narrow path between or behind buildings, that is closed at one end