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Jyutping sing3 ming6 jau4 gwaan1
Pinyin xìng mìng yōu guān

Definitions (CC-CEDICT)
  1. vitally important
  2. a matter of life and death
Definitions (Wiktionary)
  1. phrase, idiomatic
    very important
Examples (Wiktionary)
  1. Mandarin
    性命攸关
    性命攸關
    xìng mìng yōu guān
    • a matter of life and death