What it means
A dead cert is something that's basically certain to happen. It's a proper sure thing, the kind you'd back without much wobble. You'll hear it a lot in betting chat, sport, work gossip, and everyday predictions when someone reckons the result's already written.
Usage examples
"Dan turning up late again? Dead cert. He’s already pinged me saying the bus died, his lace snapped, and a bloke’s dog gave him attitude."
"She's a dead cert for the promotion, nobody else comes close."
"Rain on a bank holiday is a dead cert, so pack a brolly just in case."
"United scoring first with that defence behind them? Dead cert, mate."
"If she posts a vague quote at midnight, breakup rumours by morning are a dead cert."
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Where it comes from
It comes from British horse racing and betting slang, where cert is short for certainty. A dead cert was the one punters saw as nailed on, the horse meant to win barring total chaos. From there it trotted out of the bookies and into everyday speech for anything that feels guaranteed.
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