Wiktionary
poison-pen letters
n. (poison-pen letter English)
Usage examples of "poison-pen letters".
If poison-pen letters can get to you, you don't deserve any woman's love, let alone Rhoda's.
Wanting to see his wife, when poison-pen letters from home were accusing her of adultery?
Not that either accused the other of writing the poison-pen letters.
The phony charges, the trumped-up smears and lies and vicious poison-pen letters, mailed to Unity without signature.
In a normal culture they are the type of people who write poison-pen letters.