From Longman Dictionary of Contemporary Englishdaybreakday‧break /ˈdeɪbreɪk/ noun [uncountable]TMthe time of day when light first appearsSYN dawn
We arrived in Cairo at daybreak.Examples from the Corpusdaybreak• This liberation usually took place about daybreak on Wednesday.• At daybreak, officers began a house-to-housesearch.• At daybreak or dusk, the pyramids most resemble the limestonemonuments seen by the old explorers.• Conditions were so bad that emergencycrews were told it was too dangerous to try and restore power before daybreak.• The firessignalled to something else as well ... Shortly before daybreak Tallis was woken by the distant sound of a huntinghorn.• By daybreak, they are working together, cleaning up their rooms.• The battle began at three in the morning and continued uninterrupted until pastdaybreak.• She did not fall asleep until daybreak.