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Jyutping jim4 cing4 bat1 taai3
Pinyin yán chéng bù dài

Definitions (CC-CEDICT)
  1. to punish severely (idiom)
Definitions (Wiktionary)
  1. phrase, idiomatic
    to punish severely without mercy; to punish mercilessly
Examples (粵典–words.hk)
  1. Cantonese
    严惩不贷
    嚴懲不貸
    • to punish with due severity