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Noun: dead letter  ded 'le-tu(r)
  1. The state of something that has outlived its relevance
    - non-issue
     
  2. Mail that can neither be delivered nor returned
    - dead mail

Derived forms: dead letters

Type of: letter, missive, state

Encyclopedia: Dead letter

Nearest

dead body
dead center
dead centre
dead drop
dead duck
dead end
dead hand
dead hand of the past
dead heat
dead language
dead letter
dead load
dead mail
dead march
dead metaphor
dead nettle
dead on target
dead person
dead reckoning
dead ringer
dead room