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Jyutping bun3 siu2 sei2
Pinyin bàn xiǎo sǐ

Definitions (Wiktionary)
  1. adv, Hokkien, Quanzhou, Xiamen
    used as a verbal or adjectival complement emphasising the severity of an action or a state
    (syn.) 半倒死, 半囝, 半死, 要命