from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun An alley or passage that is closed at one end.
  • noun A mistaken, unproductive undertaking.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun Used other than as an idiom: see blind,‎ alley. A street or passageway that leads nowhere.
  • noun figuratively A course of inquiry that leads nowhere.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a street with only one way in or out
  • noun (figurative) a course of action that is unproductive and offers no hope of improvement


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