English translation: to break out in measles/ to have the measles
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Explanation: In the context in which it is used here: "If this job is not done this year, I will break out with measles". Sometimes the breaking out of measles does not happen quickly, prolonging the incubation period, and therefore the recovery period from the disease. I believe, in this context, it means that if this job is not completed this year, it will be like coming down with measles. It must be a saying.