Dead letter Meaning, Definition & Usage
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noun the state of something that has outlived its relevance
non-issue.
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noun mail that can neither be delivered nor returned
dead mail.
WordNet
Definitions
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(a) A letter which, after lying for a certain fixed time uncalled for at the post office to which it was directed, is then sent to the general post office to be opened.(b) That which has lost its force or authority; as, the law has become a dead letter.
