[--]

Jyutping gung1 kei4 mou4 bei6
Pinyin gōng qí wú bèi

Definitions (Wiktionary)
  1. phrase, idiomatic
    to attack when the enemy is unprepared

攻其無備 [--无备]

Jyutping
Pinyin gōng qí wú bèi

Definitions (CC-CEDICT)
  1. see 出其不意,攻其不備|出其不意,攻其不备[chu1 qi2 bu4 yi4 , gong1 qi2 bu4 bei4]