Early morning light or the light of dawn, associated with the time when roosters crow.
Compound of cock (rooster, associated with early morning through its crowing) and light. Used poetically and literally to refer to the time of day when roosters begin their calls.
Before electric lighting, people used natural phenomena like 'cocklight' and 'cockcrowing' as actual time markers in their daily lives—you'd wake 'at cocklight' or start work 'by cocklight,' showing how roosters literally structured human schedules.
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