What it means
A dead heat is a flat tie. Two sides finish exactly level, so there’s no winner to point at yet. It started in racing and gets used for elections, quizzes, matches, the lot. If someone says it was a dead heat, they mean it was so absurdly close the result needs a photo, recount, runoff, or some other bit of admin misery.
Usage examples
"Council election ended in a dead heat, so they’re doing a recount tomorrow. I’d already promised the lads pints, now I’m stuck waiting again."
"The two horses crossed the line in a dead heat, they had to check the photo."
"The vote ended in a dead heat, so they're holding a runoff next week."
"It was a dead heat between Jess and Amir in the pub quiz, so the barman had to dig out a tie-breaker question from the chaos drawer."
"Polls have it in a dead heat, which is politician code for nobody’s sleeping easy tonight."
Where it comes from
It comes from horse racing. Back in the 18th century, if two horses finished exactly level in a heat, it was called a dead heat because the heat produced no winner. The racing sense stuck, then wandered off into politics, sport, quizzes, and any contest that ends bang level.
