Definition of poison pen letter noun from the Oxford Advanced Learner's Dictionary


poison pen letter

BrE BrE//ˌpɔɪzn ˈpen letə(r)//
; NAmE NAmE//ˌpɔɪzn ˈpen letər//
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an unpleasant letter that is not signed and is intended to upset the person who receives it
See the Oxford Advanced American Dictionary entry: poison pen letter