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Cockcrow is an old, slightly word for the very early morning — the time when start to call, around first light. People used it the way we now say dawn or . You find it in older stories, in the Bible, and in lines like “before cockcrow”. Though actually almost nobody says “I’ll meet you at cockcrow” in ordinary talk today; they say at dawn, at first light, or first thing in the morning. The word names a time of day, not the sound itself. The sound is the crowing. It is not rude and not slang; it just feels old and a little literary.
雞鳴時分、黎明（偏書面；口語多說天亮、一大早）
組成From Middle English cok crowe (also cokkes crowe), cock + crow. It likely took the place of Old English hancrǣd, which meant the same thing, literally “cock-crowing”, from hana (cock, rooster) + crǣd (crowing).
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
cockcrownoun
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The time of day at which the first crow of a cockerel is heard; dawn or daybreak; first light.
- The unfortunate shepherd that approaches them must dance their rounds with them till cock-crow; and the instances are not few of persons thus ensnared who have been found next morning dead with exhaustion and fatigue.
- 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.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。