From Longman Dictionary of Contemporary Englishat first lightat first lightliteraryEARLY very early in the morning The search will resume at first light tomorrow. → first
Examples from the Corpus
at first light• The search continued at first light.• It was black as night at new moon and white as frost at first light.• Mountain rescue teams continued the hunt overnight, and a full-scale search resumed at first light.• The Caribou took off at first light.• They left camp at first light and were in the mountains by nightfall.• A small flock of evening grosbeaks flew over, and at first light I heard chickadees and goldfinches.• The ambush would leave its position the next morning, at first light, to return.• We have had trouble at first light with the Khmer Rouge. 