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Dear John

noun Informal.
  1. a letter from a woman informing her boyfriend or fiancé that she is ending their relationship or informing her husband that she wants a divorce: Nothing is worse for a soldier's morale than getting a Dear John.
  2. any letter terminating a relationship.
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Origin of Dear John

First recorded in 1940–45
Also called Dear John letter.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018