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      a law or treaty which has not been repealed but is ineffectual or defunct in practice.;a thing which is unimportant or obsolete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

    • 釋義

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 a law or treaty which has not been repealed but is ineffectual or defunct in practice.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