謗書 [谤书]

Jyutping pong3 syu1
Pinyin bàng shū

Definitions (Wiktionary)
  1. noun, archaic
    letter that criticizes
  2. noun, literary
    libel; defamatory writing
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）