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that is undeliverable and unreturnable, typically one with an incorrect address.;a law or treaty that has not been repealed but is ineffectual or defunct in practice.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

    • 釋義

    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 a law or treaty that has not been repealed but is ineffectual or defunct in practice.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