English version

conversion course

From Longman Dictionary of Contemporary Englishconversion courseconˈversion ˌcourse noun [countable] British English  a course for students who have some knowledge of a subject, but who need slightly different or more knowledge in order to do something A qualified pilot would still need a conversion course to fly microlight aircraft.
Examples from the Corpus
conversion courseI proved my ability in further education and attempted to gain a position on a conversion course.Another group of supervisors from light manufacturing industry are undertaking a conversion course to catering supervisor.At Seletar he had been flying Vildebeest torpedo bombers, and he now underwent a conversion course on to the more modern Beauforts.From now on all aircrew went through either a full conversion course or a short refresher course.
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