Something that revitalizes or restores, often a training course that updates knowledge you've forgotten or learned long ago.
From 'refresh' (to restore strength), combined with agent suffix '-er.' 'Refresh' comes from Old French 'rafraichir' (to cool, restore).
Memory research shows that 'refresher' training works best with spaced repetition over weeks—cramming everything at once defeats the purpose, which is why workplaces schedule refreshers poorly.
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