as open as the day 光明磊落；开诚布公；光明正大

【例句】
She was as open as the day, and this attack from the people who skulked in darkness make her ill.
她光明磊落，但躲在阴暗角落里的人们的攻击使她病倒了。

I'd trust her with my life's savings — she's as open as the day.
我会把一生的存款都交给她——她是极其诚实的。