refresher

• POS: Noun
• HYPHEN: re=fresh=er

CIDE DICTIONARY

refresher, n. 

•  One who, or that which, refreshes.  [1913 Webster]
•  An extra fee paid to counsel in a case that has been adjourned from one term to another, or that is unusually protracted.  [1913 Webster]

  "Ten guineas a day is the highest refresher which a counsel can charge."  [1913 Webster]

OXFORD DICTIONARY

refresher, n.
1 something that refreshes, esp. a drink.
2 Law an extra fee payable to counsel in a prolonged case.

Idiom

refresher course a course reviewing or updating previous studies.