at the crack of dawn

US /æt ðə kræk əv dɔn/
UK /æt ðə kræk əv dɔn/
"at the crack of dawn" picture
1.

在黎明時分, 一大早

very early in the morning, at the first sign of light

:
We had to leave at the crack of dawn to catch our flight.
我們必須在黎明時分出發趕飛機。
The farmers start their work at the crack of dawn.
農民們在黎明時分開始工作。