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Dear John

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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
British Dictionary definitions for dear john letter

Dear John letter

noun
  1. informal a letter from someone (esp to a man) breaking off a love affair
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012