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Jyutping gam2 wai4 jan4 sin1
Pinyin gǎn wéi rén xiān

Definitions (CC-CEDICT)
  1. to dare to be first
  2. to pioneer (idiom)
Definitions (Wiktionary)
  1. phrase, idiomatic
    to have the courage to do what others have not done; to have the courage to take the lead