What it means
Means stupidly early in the morning, right as it’s getting light and everyone normal is still horizontal. You’ll hear it when someone’s moaning about an early start, a long drive, a flight, or a job that hates joy. It’s not a precise time, more a vibe, and that vibe is: why am I awake.
Usage examples
"Had to be at Heathrow for six, so I was up at the crack of dawn, necked a brew, and stumbled out half-asleep."
"My father-in-law gets up at the crack of dawn every Saturday to drive forty miles to the fishing reservoir in the Lake District, packs his thermos of tea and ham sandwich the night before, and is back at the kitchen table by lunchtime with two trout for the freezer and three tall tales for the family."
"The film crew was up at the crack of dawn on the beach in Cornwall to catch the golden hour for the closing shot of the romance, the actors stood shivering in summer costumes against the wind from the Atlantic, and the director was happy with the take by the second cup of coffee from the catering van."
"We had a stupidly cheap flight, which sounds great till you're dragging yourself to the airport at the crack of dawn with one eye open."
"Mum had us up at the crack of dawn to beat the traffic, and the whole car was silent apart from me sulking into a sausage roll."
Where it comes from
It grows out of the older phrase crack of day, which shows up in English as far back as the 1600s. Here, crack meant the first split or break of light as night starts giving up. Crack of dawn took over later and stuck in both British and American English for that rude first sliver of morning.
