A poison pen letter - When you write a letter to someone without any name of the sender, or address and have written something bad about the recipient, that letter is known as a poison pen letter.
Sample Usage
1. I just received a poison pen letter; I don't know who has sent it.
2. Poison pen letters often consist of threatening.
3. Well, never believe on any poison pen letter, it may be a big joke by someone also.
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