poison-pen letter
noun [ C ] uk/ˌpɔɪ.zənˈpen ˌlet.ər/ us/ˌpɔɪ.zənˈpen ˌlet̬.ɚ/
恶意中伤的信;匿名诽谤信
a letter in which very unkind or unpleasant things are written about the person it is sent to, in order to offend or upset them
英汉双解词典收录81607条英汉双解翻译词条，基本涵盖了全部常用单词的读音、翻译及用法，是英语学习的有利工具。