a fee (in addition to that marked on the brief) paid to counsel in a case that lasts more than one day
"The law firm billed an extra refresher of two thousand dollars for the second day of trial since it had exceeded the initial estimate."
a course that reviews and updates a topic for those who have not kept abreast of developments
"After attending the annual conference, Sarah enrolled in an online refresher to update her knowledge on the latest cybersecurity protocols."
Something that refreshes.
"After weeks of working on a dry project, we decided to take a trip by the lake as a nice refresher for our spirits."