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dead letter
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Quick answer
As a noun, dead letter means the state of something that has outlived its relevance.
Meanings of dead letter
2 meaningsnoun
The state of something that has outlived its relevance
Similar: non-issueMail that can neither be delivered nor returned
Similar: dead mail
Meanings from Wiktionary (CC BY-SA 4.0) and Open English WordNet (CC BY 4.0).
Synonyms by meaning
noun: the state of something that has outlived its relevance
non-issue
noun: mail that can neither be delivered nor returned
dead mail