'break of day' definitions:

Definition of 'break of day'

(from WordNet)
noun
The first light of day; "we got up before dawn"; "they talked until morning" [syn: dawn, dawning, morning, aurora, first light, daybreak, break of day, break of the day, dayspring, sunrise, sunup, cockcrow] [ant: sundown, sunset]

Synonyms of 'break of day'

From: Moby Thesaurus

Words containing 'break of day'