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Jyutping co1 gang1
Pinyin chū gēng

Definitions (Wiktionary)
  1. noun, archaic
    first watch (between 7:00pm and 9:00pm)

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Jyutping co1 gaang1
Pinyin chū gēng

Definitions (CC-CEDICT)
  1. first of the five night watch periods 19:00-21:00 (old)