dead end
noun
something, as a street or water pipe, that has no exit.
Used to describe actions that started in the past and continue into or have direct relevance to the present.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Imagine walking through a maze, for years and years, to find that your path has dead-ended near the exit.
From The Guardian ● Dec. 19, 2017