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dead letter

noun

Simple Definition of dead letter

  • : a letter that cannot be delivered or returned by the post office because of an incorrect address or other problem

  • : a law or agreement that has lost its force or authority

Source: Merriam-Webster's Learner's Dictionary

Full Definition of dead letter

  1. 1 :  something that has lost its force or authority without being formally abolished

  2. 2 :  a letter that is undeliverable and unreturnable by the post office

1627

First Known Use of dead letter

1627


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