تعريف refresher course في الإنجليزية الإنجليزية القاموس.
a course that reviews and updates a topic for those who have not kept abreast of developments
A refresher course is a training course in which people improve their knowledge or skills and learn about new developments that are related to the job that they do. re·fresh·er a training course, usually a short one, that teaches you about new developments in a particular subject or skill, especially one that you need for your job