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Jyutping je5 sam1 but6 but6
Pinyin yě xīn bó bó

Definitions (CC-CANTO)
  1. to be overweeningly ambitious
Definitions (Wiktionary)
  1. phrase, idiomatic
    wildly ambitious
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)