ENGLISH
REFERENCE

poison-pen letter

idiom

A missive which is malicious, insulting, and/or defamatory toward a person, organization, or point of view, especially one which is unsigned.

Anchors to
Related idioms2entries
  1. 01

    red letter day

    A particularly significant day; a day of personal or sectarian celebration.

  2. 02

    to the letter

    Literally, exactly, following the rules as written.

© 2026 English Reference