Dear John let·ter
noun/ˌdɪə ˈdʒɒn letə(r)/
/ˌdɪr ˈdʒɑːn letər/
(also Dear John)
(informal)- 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.
亲爱的约翰（John）的来信：女人给男人的一封信，说她想终止他们的恋爱关系。这通常是因为她现在爱别人。