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Definition of refresher course noun from the Oxford Advanced Learner's Dictionary

refresher course

noun
 
/rɪˈfreʃə kɔːs/
 
/rɪˈfreʃər kɔːrs/
(also refresher especially in North American English)
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  1. a short period of training to improve your skills or to teach you about new ideas and developments in your job
See refresher course in the Oxford Advanced American Dictionary
dressing
noun
 
 
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