The phrase describes a published volume, once considered current, that has declined in usefulness or relevance, frequently appearing as a solution in the New York Times crossword puzzle. This type of clue often relies on knowledge of older terminology, technologies, or cultural references that are no longer widely known or used. An example might be a term related to outdated computer hardware or a once-common phrase that has fallen out of favor.
The inclusion of these answers in a popular word puzzle serves multiple purposes. It introduces solvers to historical perspectives and vocabulary, prompting reflection on how language and technology evolve. It also presents a challenge, requiring solvers to consider contexts beyond contemporary usage. The presence of these types of clues implicitly acknowledges the transient nature of information and the continuous process of language adaptation.
