English

Definition of dead letter noun from the Oxford Advanced Learner's Dictionary

     

    dead letter

     noun
    noun
    BrE
     
    ; NAmE
     
     
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  1. 1[usually singular] a law or an agreement that still exists but that is ignored The treaty had been a dead letter for many years.
  2. 2(especially North American English) a letter that cannot be delivered to an address or to the person who sent it
See the Oxford Advanced American Dictionary entry: dead letter