振聾發聵 [－聋发聩]

Jyutping zan3 lung4 faat3 kui2
Pinyin zhèn lóng fā kuì

Definitions (CC-CEDICT)
  1. lit. so loud that even the deaf can hear (idiom); rousing even the apathetic
Definitions (Wiktionary)
  1. phrase, idiomatic
    to rouse the deaf and awaken the unhearing; to awaken the deaf; to enlighten the benighted
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）