up a blind alley

*up a blind alley

Fig. at a dead end; on a route that leads nowhere. (*Typically:be ~; go ~.) I have been trying to find out something about my ancestors, but I'm up a blind alley. I can't find anything. The police are up a blind alley in their investigation of the crime.
See also: alley, blind, up
References in periodicals archive ?
Even the most sophisticated new technology can occasionally send you up a blind alley - or a flooded tunnel.
And with tax cuts, tough talk on immigration and ranting about Europe, he's heading up a blind alley. Cameron's retreating to a traditional Tory platform with a green tinge.
The Government's own advisors have since admitted that the research led up a blind alley.
But that dichotomy runs up a blind alley, says Jenkins.