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dead cert

A dead cert s the shortened form of a dead certainty, meaning a complete certainty. It's a term often used in sports gambling, but also sometimes in business.

"It's a dead cert that he'll get the job - his uncle is on the selection board."

Note:
Interesting that the word dead doesn't always refer to death:

to be dead-on = den Nagel auf den Kopf treffen
dead calm = die Flaute
dead center = genauer Mittelpunkt
dead drunk = sinnlos betrunken
dead easy = kinderleicht
dead end = die Sackgasse
dead faint = tiefe Ohnmacht
dead freight = zu zahlende aber nicht genutzte Fracht
dead letter = unzustellbarer Brief
dead market = flauer Markt
dead reliable = völlig zuverlässig
dead silence = absolute Stille
dead space = ungenutzter Raum
dead storage = verlorener Speicherraum
dead straight = schnurgerade
dead sure = todsicher
dead time = die Verlustzeit
dead tired = todmüde