small hours
US /smɔl ˈaʊərz/
UK /smɔl ˈaʊərz/

1.
凌晨, 清晨
the early hours of the morning, between midnight and about 4 a.m.
:
•
We stayed up talking until the small hours.
我们一直聊到凌晨。
•
The party went on into the small hours of the morning.
派对一直持续到凌晨。