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Jyutping man4 gai1 hei2 mou5
Pinyin wén jī qǐ wǔ

Definitions (CC-CEDICT)
  1. to start practicing at the first crow of the cock (idiom)
  2. to be diligent in one's studies
Definitions (Wiktionary)
  1. phrase, idiomatic
    to be a go-getter; to be a self-starter
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)