光天化日 [- tiān huà rì]The sun lightens up the sky — said of peaceful times.; a bright sky and a benign sun; in [under] broad daylight; in the open day; the light of day：
•¶ 把敌人玩弄的阴谋诡计暴露在光天化日之下 bare the enemy's intrigues to the light of day
•¶ 他们竟敢在光天化日之下犯这种罪行。 They even committed such crimes in broad daylight.