天機不可泄露 [ㄊㄧㄢ ㄐㄧ ㄅㄨˋ ㄎㄜˇ ㄒㄧㄝˋ ㄌㄨˋ; tian1 ji1 bu4 ke3 xie4 lu4] lit. mysteries of heaven must not be revealed (idiom); must not be revealed I am not at liberty to inform you. ◄ ►