cockcrow

noun

Etymology: From Middle English cok crowe (also as cokkes crowe), equivalent to cock + crow. Likely a suppletive variation of Old English hancrǣd (“cockcrow, dawn”, literally “cock-crowing”), from hana (“cock, rooster”) + crǣd (“crowing”).

1. The time of day at which the first crow of a cockerel is heard; dawn or daybreak; first light

   “I put the chief of police behind the bar, instructed him in his duties, and we four convivial spirits sprawled along the counter drinking ale and telling yarns till cockcrow.”