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Jyutping baak6 dou1 zi2 zeon3 heoi3 , hung4 dou1 zi2 ceot1 loi4
Pinyin bái dāo zi jìn qù , hóng dāo zi chū lái

Definitions (Wiktionary)
  1. phrase, colloquial, idiomatic
    to kill; to murder