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1. Oxford American Dictionary

   dead letter

   • IPA[ˌded ˈledər]

   美式

   • n.
     a letter that is undeliverable and unreturnable, typically one with an incorrect address.；a law or treaty that has not been repealed but is ineffectual or defunct in practice.

   • noun: dead letter, plural noun: dead letters

2. • 釋義

   n.

   名詞

   • 1. North American a letter that is undeliverable and unreturnable, typically one with an incorrect address.
   • 2. a law or treaty that has not been repealed but is ineffectual or defunct in practice.
   • ▪ a thing that is impractical or obsolete theoretical reasoning is a dead letter to a child