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English definition of “at the crack of dawn”

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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.
Translations of “at the crack of dawn”
in Chinese (Traditional) 大清早,黎明,破曉時分…
in Chinese (Simplified) 大清早,黎明,破晓时分…
(Definition of at the crack of dawn from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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