the time when the light begins to appear in the morning
dawn
daybreak
cock-crow
break of day
crack of dawn
daylight
sunrise or sunup
The search for the missing children will continue at first light.
We have to leave at first light if we want to make it to the other side of the mountain by midday.
At first light, the elephants went in search of a watering hole.
We will leave at first light.
America and allies had finally decided that the nuclear bomb would be dropped at first light on two cities Hiroshima and Nagasaki of Japan.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.