at the crack of dawn
C2 very early in the morning, especially at the time when the sun first appears:
We'll have to leave at the crack of dawn.
Thesaurus: synonyms and related words
Days & times of day
- afternoon
- afternoons
- am
- bedtime
- circadian
- crepuscular
- dawn
- last orders
- lighting-up time
- local time
- lunch hour
- lunchtime
- office hours
- opening time
- overnight
- playtime
- pm
- rush hour
- twilit
- watershed
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