"refresher" in the noun sense
a fee (in addition to that marked on the brief) paid to counsel in a case that lasts more than one day
a drink that refreshes
"he stopped at the bar for a quick refresher"
3. refresher course, refresher
a course that reviews and updates a topic for those who have not kept abreast of developments
Source: WordNet® (An amazing lexical database of English)
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