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Definition of Poison pen
1. Noun. (idiomatic) A manner, means, or tone of expression had by a written work, characterized by spitefulness, defamation, and/or intimidation directed toward a person, organization, or point of view. ¹
2. Noun. (attributive sometimes hyphenated) Of, pertaining to, or possessing such a manner of expression. ¹
¹ Source: wiktionary.com