at the crack of dawn

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

새벽녘에, 아침 일찍

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

:
We had to leave at the crack of dawn to catch our flight.
비행기를 타려면 새벽녘에 출발해야 했다.
The farmers start their work at the crack of dawn.
농부들은 새벽녘에 일을 시작한다.