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
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