(proverb)when things seem to be at their worst they are about to start improving
(谚)黎明前最黑暗
keep something secret from other people
保密
an act whose outcome cannot be foreseen; a mere guess
瞎碰；臆测
In secret
秘密地
high-level decisions made in the dark.
高层决定是秘密地制定的
In a state of ignorance; uninformed
一无所知地；未通知地
kept me in the dark about their plans.
我对他们的计划一无所知