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1. Oxford Dictionary

   dead letter

   • IPA[ˌdɛd ˈlɛtə]

   英式

   • n.
     a law or treaty which has not been repealed but is ineffectual or defunct in practice.；a thing which is unimportant or obsolete

   • noun: dead letter, plural noun: dead letters

2. • 釋義
   • 相關詞

   n.

   名詞

   • 1. a law or treaty which has not been repealed but is ineffectual or defunct in practice.
   • ▪ a thing which is unimportant or obsolete theoretical reasoning is a dead letter to a child
   • 2. North American an unclaimed or undelivered piece of mail.

   dead letter box

   • n.
     a place where messages can be left and collected without the sender and recipient meeting.

   Oxford Dictionary

3. • 更多解釋

   dead letter

   • IPA[ˌded ˈledər]

   美式

   • n.
     a letter that is undeliverable and unreturnable, typically one with an incorrect address.

   Oxford American Dictionary