dead letter

/ˌdɛd ˌlɛdər/
IPA guide

Other forms: dead letters

Definitions of dead letter
  1. noun
    mail that can neither be delivered nor returned
    synonyms: dead mail
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    type of:
    letter, missive
    a written message addressed to a person or organization
  2. noun
    the state of something that has outlived its relevance
    synonyms: non-issue
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    type of:
    state
    the way something is with respect to its main attributes
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