at the crack of dawn
US /æt ðə kræk əv dɔn/
UK /æt ðə kræk əv dɔn/

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.