As a language expert with a deep understanding of idioms and their meanings, I can provide you with a clear explanation of the idiom "up a blind alley."

The idiom "up a blind alley" means to be in a situation that is not going to lead to a successful outcome or solution. It is often used to describe a line of reasoning or a course of action that is not going to be productive or useful. The term originates from the literal concept of a blind alley, which is a street or passage that has only one entrance and no exit, implying that one is trapped with no way out.

Here's the explanation with the key term highlighted: "up a blind alley" means to be in a situation that is not going to lead to a successful outcome or solution.

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Up a Blind Alley. Mar 10, 2013. When you use the phrase 'Up a Blind Alley' you mean that someone is following a course of action that is certain to lead to an undesirable outcome.read more >>