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Jyutping sing3 ming6 gaau1 gwaan1
Pinyin xìng mìng jiāo guān

Definitions (CC-CANTO)
  1. a situation which is so important that it concerns people's lives
Definitions (Wiktionary)
  1. phrase, idiomatic
    to be a matter of life and death; of vital importance
    (syn.) 性命关天, 性命關天
Examples (Wiktionary)
  1. Mandarin
    性命交关
    性命交關
    xìng mìng jiāo guān
    • vitally important (lit. related to life)