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3. up a blind alley

up a blind alley

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*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