گزارش خطا در معنی کلمه 'up a blind alley'

1 general:: Phrase(s): *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.