Dear John letter

noun
🔊/ˌdɪə ˈdʒɒn letə(r)/
🔊/ˌdɪr ˈdʒɑːn letər/
(also Dear John)
(informal)
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  1. a letter sent by a woman to a man to say that she wants to end their relationship. This is usually because she now loves someone else.