九成九 [－－－]

Jyutping gau2 sing4 gau2
Pinyin jiǔ chéng jiǔ

Definitions (CC-CANTO)
  1. 99%, most probably or likely
Definitions (Wiktionary)
  1. noun, Cantonese
    most likely
    (syn.) 八成, 八開, 八开