noun
a dead cert
adjective
dead - devoid of life, cert - short for certainty, indicating something that is guaranteed or certain
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Based on the data and analysis, the outcome of the project is a dead cert.
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With her skills and experience, getting the job is a dead cert for her.
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I'm telling you, his team winning the championship is a dead cert.
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The way he's been practicing, his success in the competition is a dead cert.