萬事皆備，只欠東風 [万－－备－－－东风]

Jyutping maan6 si6 gaai1 bei6 , zi2 him3 dung1 fung1
Pinyin wàn shì jiē bèi , zhǐ qiàn dōng fēng

Definitions (CC-CEDICT)
  1. everything is ready, all we need is an east wind (idiom)
  2. lacking only one tiny crucial item
  3. also written 萬事俱備，只欠東風|万事俱备，只欠东风