天機不可泄漏 [－机－－－－]

Jyutping tin1 gei1 bat1 ho2 sit3 lau6
Pinyin tiān jī bù kě xiè lòu

Definitions (CC-CEDICT)
  1. lit. mysteries of heaven must not be revealed (idiom); must not be revealed
  2. I am not at liberty to inform you.